kr\ %W) Division of Agricult UNIVERSITY O Sciences L F O R N I la fv ii^m w OR CALIFORNIA'S MIDDLE ELEVATION DESERT M. E. Mathias W. Metcalf M. H. Kimball C. L. Hemstreet D.E.Gilbert W.-B. Davi CALIFORNIA AGRICULTURAL EXPERIMENT STATION BULLETIN 839 Digitized by the Internet Archive in 2012 with funding from University of California, Davis Libraries http://www.archive.org/details/ornamentalsforca0839math ,11 mmMMMM^Mmi FOR CALIFORNIA'S MIDDLE ELEVATION DESERT 1 his publication had its origins in a plant study initiated in 1956 which in- cluded many exploratory trips to nearly all settled sections of California's segment of the Mojave Desert. The study revealed a large number of orna- mental trees, shrubs, vines, ground covers, and annual flowering plants growing satisfactorily in this rigorous environment. The area, its many climates, and the plants found there by the authors are briefly described here. Typical home in Middle Elevation Desert area (photo courtesy of Barstow Chamber of Commerce). March, 1968 THE AUTHORS: Mildred E. Mathias is Professor of Botany, University of California, Los Angeles. Woodbridge Metcalf is Extension Forester Emeritus, Agricultural Extension Service, University of California, Berkeley. Marston H. Kimball is Extension Bioclimatologist Emeritus, Agricultural Extension Service, University of California, Los Angeles. Chester L. Hemstreet is County Director and Farm Advisor, Agricultural Extension Service, Lake County. Dewayne E. Gilbert is Extension Bioclimatologist, Agricultural Extension Service, University of California, Davis. William B. Davis is Extension Ornamental Horticulturist, Agricultural Extension Service, University of California, Davis. ORNAMENTALS FOR CALIFORNIA'S MIDDLE ELEVATION DESERT1 CALIFORNIA DESERTS Sections of three well-known deserts com- prise nearly the entire eastern part of California. They lie east of a chain of high mountain ranges, extending from Oregon into Mexico, which form a generally effec- tive barrier to eastward movement of moist Pacific air masses. These deserts all lie in California's PLANTCLIMATE V (figure 1) and include the driest, the hot- test, and nearly the coldest sections of California. In east-central and northeastern Cali- fornia lies the western edge of the Great Basin Desert. This is California's HIGH ELEVATION DESERT, with valleys 4500 to 6000 feet high and plateaus rang- ing from 6000 to 8000 feet. The climate ranges from arid, cold-temperate to sub- alpine in higher elevations. In east-central and southeastern California are large sec- tions of the Mojave and the Colorado Desert portion of the vast Sonoran Desert complex. The latter is California's LOW ELEVATION DESERT; its climate is subtropical throughout. Its upper eleva- tion (1000 feet above sea level) coincides with the approximate upper climate limit of subtropical conditions. It includes culti- vated valleys from 120 to nearly 200 feet below sea level. Death Valley is located in the Middle Elevation Desert but is con- sidered part of the Low Elevation Desert due to its elevation. California's MIDDLE ELEVATION DESERT is nearly half of the Mojave Desert. Its climate ranges from arid-warm-temperate to arid-cool- temperate in higher valleys, and to sub- alpine in high mountains. In the Middle Elevation Desert, the authors' special attention was paid to fruit and nut growing, as the behavior of al- mond, apricot, peach, cherry, plum, pear, apple, pecan, walnut and olive trees pro- vides unique information which can be re- lated to behavior of ornamentals. Factors involved in such behavior are: winter temperature effectiveness in breaking dor- mancy; spring and fall frost conditions; summer temperature; location and boun- daries of warm thermal zones or thermal belts (see "Glossary," pages 15-16) on air-drained slopes and low hills; and the effect of such things as varying exposures and mountain shelters. The High Elevation Desert contains some 9,200 square miles, the Low Eleva- tion Desert about 10,200, and the Middle Elevation Desert approimately 38,800 square miles. The total of all deserts, 58,- 200 square miles, is about 37 per cent of the state's area. California's Middle Elevation and Low Elevation Deserts are closely associated geographically and climatically. These two deserts occupy an area about 380 miles long, northwest to southeast, and each desert extends almost the entire dis- tance. East to west they are from 100 to 240 miles wide, narrowing to a point in the extreme north. The Middle Elevation Desert has an area of about 38,800 square miles — ap- proximately equal to the combined areas of Vermont, New Hampshire, Massachu- setts, Rhode Island, Connecticut and Delaware plus one-third of Maryland. THE MIDDLE ELEVATION DESERT Location and Elevation The Middle Elevation Desert (as here con- sidered) includes all desert areas between 1000 and 7000 feet above sea level. In the north the boundary is the lower climatic limit of the High Elevation Desert, 7000 1 Submitted for publication April 28, 1967. feet around Owens Valley to 5500 feet at the south end of the Inyo Mountains. Through central and southern California the western boundary gradually lowers from about 6000 feet on the east face of the Sierra Nevada at the south end of [3] Owens Valley, to below 4000 feet in southern San Diego County. Main valley floors range from 2000 to 4500 feet elevation. The surrounding al- luvial slopes rise to varying heights, dif- fering with the size of the valley and with the elevation of the valley floor. These air-drained slopes extend as high as 6000 feet around the north end of Owens Val- ley. The Middle Elevation Desert in- cludes arid-warm-temperate zone valleys and low mountains in southeastern San Bernardino County, and extends through Riverside into Imperial County to within a few miles of Mexico. It also includes the Owens Valley and smaller arid-cool- temperate zone valleys in Inyo County, where growing conditions and plant be- havior are more like the Middle than the High Elevation Desert. The Middle Elevation Desert has some mountain ranges or peaks higher than 7000 feet, and these result in several small "islands" exhibiting sub-alpine char- acteristics like those of the High Elevation Desert. Plant Selection and General Factors Choice of ornamental plants for each area must be determined by their suitability to the climate. Tolerance to low minimum and high maximum temperature is the most important single factor, but tolerance to dry atmosphere and wind is also im- portant. Any one of the following factors importantly affects growth. Water supply. Surface or gravity water for irrigation or domestic use is available only in the Palmdale Irrigation District, along the upper reaches of the Mojave River and in limited northern parts of the Owens Valley. In all other sections water for residential, agricultural or industrial uses must be pumped from underground basins. Water conditions are different in each of the more than 50 closed-basin drainage areas. Current water use exceeds annual recharge of the underground basins and is causing pumping levels to drop in many areas. With increases in population, and hence water use, this overdraft presents a serious problem. The California State Water Plan will bring water into and through the western exten- sion of the Middle Elevation Desert, about 8 miles northeast of Gorman, and will supplement local supplies. Water quality. Quality of water varies with origin. Water from deep under- ground basins is of excellent quality, as is gravity-source water. Water from shallow wells is sometimes saline enough to injure plants. Information in water quality in local areas may be available from water companies, present users, and official county and state water agencies. Water of unknown quality should be analyzed before use. Soils. Soils vary with drainage basins, with coarser materials high on valley slopes, grading usually to silts and clays on the valley floors. Valley bottoms are often lakes after heavy rains, highly saline when dry. Most valley soils are composed of alternate layers of coarse and fine-tex- tured materials; as a result large areas of caliche occur (see "Glossary"). This layered composition can interfere with water pen- etration and drainage when irrigation is introduced. Localized drainage or saline problems can develop as a result — these require the introduction of drainage and leaching procedures. Some soils are highly calcareous, and cause iron chlorosis in susceptible species. Management. Good management is vital for ornamental plantings and irrigation is the most important item. The problem is when to irrigate, how much to apply, whether to use basins, a system of small ditches and furrows or, if water under pressure is available, sprinklers to keep roots of plants in moist soil during the entire year. Desert natives (see "Glossary") require special consideration. Other man- agement operations may include mulch- ing to reduce evaporation, fertilizing, pruning, staking, protection from frost, wind and blowing sand, and pest and dis- ease control. Much information about management practices can be obtained from local nur- serymen and landscape organizations. Well-kept home and community plant- ings can be visited and studied — a suc- cessful owner is usually glad to share ex- perience. There are few books on garden- ing with particular emphasis on desert [4 High Elevation Desert (plantclimate zone 6) Middle Elevation Desert (plantclimate zones 2 3, 4, 5) Low Elevation Desert (plantclimate zone 1) Fig. 1. Plantclimate V (includes plantcl •mate zones 1 to 6). [5] • Cooperative Stations SCALE OF SEADBS Less than 5 inches 3 to 10 inches 10 to 20 inches 10 to 30 inches Fig. 2. Annual average rainfall, Middle and Low Elevation Deserts (courtesy of Environmental Science Services Administration, U. S. Weather Bureau). problems. The University of California's Agricultural Extension Public Service Of- fice at 2200 University Avenue, Berkeley, 94720, can supply lists of their publica- tions in this field. General Climatic Conditions The temperature regimes for the Middle Elevation Desert are shown in graphic form on pages 11-13, and in tabular form on pages 18-23. Daily temperature fluc- tuations of 30 to 50 degrees or more are normal. Seasonal fluctuations are from 30 to 40 degrees. Two kinds of cold. Two kinds of cold weather problems occur and are impor- tant considerations in plant selection. The first is the normal seasonal low tempera- ture, ranging from 10 to 12 degrees below monthly mean minimums; plants must be able to tolerate these temperatures. The second type of cold is the "once in 50 year" freeze when temperatures drop 20 to 30 degrees below the average of monthly mean minimums. Permanent plantings such as windbreaks and shade trees should be coldhardy for these ex- tremes, as they require years to replace. An average of the lowest recorded tem- peratures in major subzones will be found on pages 18-23. Rainfall. In the Middle Elevation and Low Elevation Deserts over 60 per cent of the area receives less than 5 inches of annual rainfall, and only a narrow belt along the west and southwest boundary receives more than 10 inches (see map, page 6). The normal rainy season is late November through March, with a some- what longer season at high elevations. Summer rain is localized and may be of cloudburst proportions. Sunshine. The percentage of sunshine is high, with nearly all the area having 250 to 275 clear days, 45 to 70 partly cloudy, and 40 to 50 cloudy days. Humidity. The high number of days of sunshine, high temperatures and low rain- fall results in exceedingly dry atmosphere. As a result, evaporation and plant tran- spiration are high. Humidity is high only during rainy periods. Humidity in the rainy season is between 30 and 60 per cent during daylight hours, but is as low as 5 to 20 per cent during the diy season. Growing season. Page 8 shows the num- ber of days between the last spring and first fall day with a 32 degree minimum. Significantly longer growing seasons occur on air-drained slopes above all valleys, resulting in freedom from 32 degree frosts but more importantly from 28 degree frosts — particularly in spring, which al- lows fruit growing and successful use of more tender ornamentals. The difference between Palmdale, 2655 feet elevation with a 225 day growing season, and Palm- dale Airport, 2517 feet and a 205 day growing season illustrates this point. The bloom of pears and other fruit usually escape spring frost near Palmdale, but are injured by frost too often for commer- cial orchard operations in the vicinity of the airport, which is about 2 miles out onto the valley floor. Still warmer condi- tions exist at higher elevations south and west of Palmdale, and there are similar contrasts on slopes above Bishop, Tehach- api, and other places within shorter dis- tances. Growing seasons based on 28 de- grees will be from 25 to 50 days longer than on these valley floors. Wind. Most areas have a prevailing breeze of 10 to 20 miles per hour during the day. In a few sections winds of 40 to 70 miles per hour occur in every month of the year; these greatly restrict choice of ornamentals or commercial crops, al- though temperatures are not greatly modified. All sections have occasional severe wind storms, mostly in late fall to mid-spring and usually from a northerly direction. Summertime dust storms may also occur, and tomillos (see "Glossary") often cause severe localized damage. An 8 to 12 miles per hour afternoon breeze will increase the amount of water moving from leaves or moist soil into the air, resulting in faster use of soil moisture. Wind is therefore a consideration in irrigation design and practice. Dry desert winds increase water loss from leaves and are a factor in drought tolerance. Form and structure characteristics im- portant in wind tolerance are well sum- marized in the following statement by [7] GROWING SEASON, RAINFALL, AND ALTITUDE AT VARIOUS U. S. WEATHER BUREAU STATIONS IN MIDDLE ELEVATION DESERT* _ Annual £,.,•„„ I^'JH!1 average Elevation Years of Stt,t,on s*ason rainfall (feet) record (dc,ys) (inches) Plantclimate zone 2, subzones 2.0, 2.1 (Arid-cool subtropical, and warm temperate slopes and valleys) Daggett Airport (2.0 ) 255 3.58 1922 17 Hayfleld Reservoir (2.0 ) 275 3.95 1370 25 Trona (2.1 ) 250 4.01 1695 30 Twentynine Palms (2.0 ) 259 4.09 1975 25 Plantclimate zone 3, subzones 3.0, 3.0w, 3.1, 3.1 w (arid-moderate to cool temperate air-drained slopes, foothills, and low mountainst Backus Ranch (3.1w) 212 6.56 2645 24 Barstow (3.1 ) 235 4.44 2142 20 Cantil (3.1w) 230 3.90 2010 5 China Lake (3.1w)t 204 2.30 2220 15 Fairmont (3.1 ) 253 15.00 3060 30 Haiwee (3.1 ) 234 5.94 3810 30 Inyokern (3.1w) 218 3.85 2440 11 Llano Shawnee (3.1 ) 207 6.99 3820 15 Palmdale (3.1 ) 225 8.70 2655 28 Pahrump Valley (3.1 ) 223 3.16 2830 3 Randsburg (3.0 ) 244 5.85 3570 21 Plantclimate zone 4, subzones 4.0, 4.1, 4.2, 4.3, 4.3w (arid-cool temperate main valleys and cold-air basins) Lancaster (4.3 ) 213 4.90 2350 15 Llano (4.3 ) 208 9.42 3490 14 Lucerne Valley (4.2 ) 192 4.00 3015 8 Palmdale Airport (4.3 ) 205 5.42 2517 17 Victorville (4.3 ) 193 5.41 2859 22 Plantclimate zone 3, subzones 3.2, 3.2w, 3.3, 3.3w (arid-moderate to cool temperate, air-drained slopes, foothills, and low mountains) Independence (3.2 ) 207 4.99 3950 16 Yucca Grove (3.2 ) 201 7.01 3951 18 Plantclimate zone 4, subzones 4.4, 4.5, 4.6 (arid-cool temperate high elevation valleys) Bishop Airport (4.5 ) 150 5.50 4108 40 Tehachapi (4.4 ) 163 10.66 3975 20 * No data available for plantclimate zone 5. See page 9 for explanation of subzones. f Valyermo omitted because station is located in cold, narrow canyon. Areas of persistent crop-influencing winds have the letter V after their subzone designation. % Data from U. S. Naval Air Station. [8] Eric Johnson (personal communication): "Certain forms and structures are com- mon in trees and shrubs that have tol- erance for wind. Trees will have a strong single trunk with thick tough bark to withstand the cutting of blow- ing sand. Branching will be wide- angled rather than with narrow "V" crotches which tend to split. Trees will have the ability to "grow into the wind," thus forming a uniform top without a "lean." Wood will be tough, supple and yielding so it will bend and not break. Plants with brittle wood should be avoided. Small relatively thick, wax-coated leaves, or leaves that are needle-like will offer less wind re- sistance and hence cause less strain on branches and trunk, and are less likely to be torn and shredded. Root systems should penetrate deep into the soil for a solid foundation and anchor and be wide-spread for water absorption. In shrubs the same factors apply. Many shrubs will be found with gray, hairy leaves, a good indication of drought and wind tolerance." Wind and drought tolerances of various plants will be found in the plant list (start- ing on page 24). Windbreaks. Carefully planned and man- aged windbreaks add to living comfort and to diversity of plantings, and they can almost eliminate detrimental effects of winds. A good example of an effective windbreak is the planting on the Los An- geles Bureau of Water and Power head- quarters north of Mojave: ornamentals that would not survive outside are grow- ing within the sheltered area with little or no indication of injury. However, the microclimate (see "Glossary") within shel- tered areas may result in a pool of rela- tively still air 2 to 4 degrees warmer in daytime or colder at night. This can be particularly important during blooming season; daytime warmth can advance bloom and pooled nighttime coolness can increase frost hazard enough to necessi- tate appropriate frost protection. Windbreaks may require plantings on two or three sides but rarely on four. Because they are permanent, kinds and varieties should be selected not only for tolerance of and resistance to wind, but also for ability to withstand occa- sional temperature extremes. Windbreaks should be moderately wind-permeable near the ground to avoid the pooling of air; tops should be dense and solid to give equal protection during summer or win- ter. For single-row plantings where space is limited, closely planted, erect growing evergreens will be most satisfactory. Ari- zona Cypress, Ctipressus glabra, planted 4 to 6 feet apart is a good example. Mixed conifers, evergreen, and deciduous trees and shrubs can be selected to serve as a windbreak and source of summer shade. PLANTCLIMATE ZONES AND SUBZONES In more developed areas of California, plantclimate zone and subzone bound- ' aries were located as a result of long experience with a wide range of culti- vated plants. A subsequent study of tem- perature data in the subzones revealed only slightly differing temperatures at . official Weather Bureau stations manv miles apart but having nearly the same ► elevation and exposure. In the desert, a study of temperature data for widely separated areas having nearly the same elevation also revealed a comparable tem- perature similarity. Therefore, in large sections of the desert where development is limited and widely scattered it is neces- sary to rely on elevation extensions on contour levels to establish the subzone. The authors are confident the resulting subzone boundaries will be close to the actual. Many of the subzone boundaries of the Low Elevation and Middle Eleva- tion Deserts (see folded map, inside back cover) have been established by this method. It must be recognized, however, that within subzones of relatively uniform conditions, there are variations in slope and exposure within short distances which are responsible for conditions normally 9 experienced in subzones some distance away. In Plantclimate V, differences in adap- tation and behavior of various plant species result in delineation of six pro- gressively cooler plantclimate zones, and these are numbered 1 to 6. Each such zone includes progressively cooler sub- zones: 1.0, 1.1, 1.2, etc. Desert plantclimate zones: 1 — Low Elevation Desert plantcli- mate zone, with 10 plantclimate subzones 2, 3, 4, 5 — Middle Elevation Desert plantclimate zones, each with two to seven plantclimate subzones 6 — High Elevation Desert plantcli- mate zone, with several plant- climate subzones. Because Low Elevation and Middle Elevation deserts are so closely associated geographically, and because the division established for this publication is based on plantclimate relations, a brief descrip- tion of the Low Elevation Desert is in- cluded. LOW ELEVATION DESERT Plantclimate Zone 1 Under 1000 feet elevation with sub- tropical temperatures. Normal winter frosts to 26 or 28 degrees with occasional freezes to 15 or 18 degrees (12-15+ year interval). Growing season 300 days or more. Typical crops: winter lettuce, very early tender vegetables such as summer squash, zucchini, etc. Citrus (principally grapefruit) is adapted to nearly all except lowest, coldest spots. Bermudagrass is the dominant lawn grass. MIDDLE ELEVATION DESERT Plantclimate Zone 2. Arid-cool subtropical, warm-temperate slopes and valleys This is a transition area between sub- tropical Low Elevation Desert and typical temperate zone conditions of the main valleys of the Middle Elevation Desert. Elevation is 1000 to 2200 feet. Normal winter minimums are as low as 20 to 22 degrees; occasional extremes range from 10 to 14 degrees; growing season is 250 to 280 days. The upper boundary is the climatic limit for the rice-bermudagrass plant association, hence bermudagrass is the dominant lawn grass. Subtropicals such as citrus (Citrus sp.), bougainvillea (Bougainvillea sp.), evergreen pear (Pyrus katvakamii), southern live oak (Quercus virginiana), and jujube (Zizyphus jujaba) are successful only in warm sheltered south to southwest slopes and are not found much above the 1000 foot level; deciduous fruit with low-chilling require- ment such as apricots, almonds, some peaches are grown; blossom injury due to spring frost has been observed on low- chilling varieties in years of early bloom; and summer heat will cause some loss of fruit quality. In warm sections, common lilac will show some delayed foliation and relatively poor bloom. There are two sub- divisions of this plantclimate, 2.0 to 2.1. Subzone 2.0 is under 2000 feet and in- cludes cool subtropical areas. Subzone 2.1 is Hinkley Valley at 2200 feet, Searles (Trona) and Panamint (northeast of Trona) Valleys, a border around Death Valley, and small valleys in southern Inyo County below 2000 feet elevation. Plantclimate Zone 3. Arid- moderate to cool temperate air-drained slopes, foothills and low mountains This plantclimate zone could be termed "Desert Deciduous Fruit Plantclimate Zone" because it consists of air-drained thermal zones above cold valley floors. The longer growing season permits bloom and young fruit to escape spring frost. [10] 120 \ no 100 90 80 If. 70 CO fad g 60 o UJ o 50 40 30 20 10 \ V HIGHEST RECORDED ^ \ X MEA MAX N DAILY MUM ^ \ MEA MINI N DAILY MUM \ \ \ ^ L0V REC 'EST ORDED^- ^~~" JAN. FEB. MAR APR. MAY JUN. JUL. AUG. SER OCT. NOV. DEC. Fig. 3. Average temperature: cool-subtropical, warm-temperature slopes and valleys of zone 2, subzones 2.0 and 2.1, shown on map on inside back cover. 120 110 100 90 80 70 CO UJ UJ or UJ Q 60 50 40 30 20 10 HIGHES RECORD T ED^-"^ \ MEAN C MAXlMl AILY MEAN MINIMU 3AILY M LOWES RECOR • )ED ^ JAN. FEB. MAR. APR. MAY JUN. JUL. AUG. SEP. OCT. NOV. DEC. Fig. 4. Average temperature: moderate to cool temperate air-drained slopes, foothills, and low mountains of zone 3, subzones 3.0, 3.0w, 3.1, and 3. lw, shown on map on inside back cover (the letter "w" indicates that the subzone has persistent crop-influencing winds). [ii] 120 110 100 90 80 u- 70 CO id g 60 © ui o 50 40 30 20 10 HIGHEST ^ RECORDED^/^ MEAN MAXIMl DAILY .. ^S MEAN MINIMU )AILY M^_^^-^ LOWES RECOR T . JAN. FEB. MAR. APR. MAY JUN. JUL. AUG. SER OCT. NOV. DEC. Fig. 5. Average temperature: cool temperate main valleys and cold-air basins of zone 4, subzones 4.0, 4.1, 4.2, 4.3, and 4.3w, shown in map on inside back cover. 110 100 90 80 70 *■ 60 CO Ui £ 50 o u a 40 30 20 10 0 "~~ "^ HIGH RECO iST RDED •*N \ MEAN MAXI* DAILY «UM ^ \ MEAN MINIM DAILY UM ' LOWE RECO ST . RDED / _-, ... JAN. FEB. MAR. APR. MAY JUN. JUL. AUG. SEP OCT. NOV. DEC. Fig. 6. Average temperature: moderate to cool temperate air-drained slopes, foothills, and low mountains of zone 3, subzones 3.2, 3.2w, 3.3, and 3.3w, shown in map on inside back cover. [12] no 100 90 80 70 u. 60 V) UJ o g 40 30 20 10 0 HIGHE RECOI ST »DED MEAN MAX IV DAILY UM \ MEAN MINIM DAILY JM i LOWEST y> RECORDED/^ JAN. FEB. MAR. APR. MAY JUN. JUL. AUG. SEP. OCT. NOV. DEC. Fig. 7. Average temperature: cool temperate high elevation valleys of zone 4, subzones 4.4, 4.5 and 4.6, shown in map on inside back cover. Similarly, the entire plantclimate zone is suitable for the common Eastern lilac, peonies, and other ornamentals requiring winter chilling. French hybrid lilacs may be somewhat delayed in warmer sections of subzone 3.0. Bluegrass is the dominant lawn grass. Annual flowering plants should not be planted until after spring frost unless protection can be supplied. A wide choice of suitable temperate zone ornamentals is shown in the plant list (page 24). Four subzones are divided into two groups: 3.0 and 3.1 adjacent to the main valleys, and 3.2 and 3.3 adjacent to high- elevation valleys. Slopes adjacent to main valleys. Sub- zone 3.0 ranges from 2000 to 4500 feet elevation. In this subzone it is found that the growing conditions are cooler than those of plantclimate zone 2 due to eleva- tion, but warmer than subzone 3.1 be- cause of cold air drainage. This latter is illustrated by the location of Randsburg, elevation 3520, in subzone 3.0. Records show 244-day growing season compared to 204 to 235 days, and a monthly mean minimum temperature from 1 to 4 degrees above the average for all stations in the 3.0 and 3.1 grouping that includes Rands- burg. In subzone 3.0, where wind is not a physical deterrent, almonds, apricots, grapes, sweet cherries, and medium chill- ing requiring peaches and pears will be satisfactory — this indicates that common lilac, Bleeding Heart, Peony, and similar medium-chilling-requiring ornamentals will be satisfactory. Subzone 3.1 occupies thermal slopes above main valley floors of plantclimate subzone 2.1 in southern and eastern Inyo County, with the major portion above plantclimate subzones 4.1 and 4.3 in Los Angeles and Kern counties. Elevations range from about 2700 to 4700 feet. The growing season is from 204 to 235 days, except for Fairmont where the U. S. Weather Bureau station is near a /4-square mile reservoir which modifies local tem- peratures. The full range of winter-cold- requiring ornamentals will perform satis- factorily. [13] Slopes adjacent to high valleys. Eleva- tion of subzone 3.2 ranges from 3000 or 3200 feet at the south end of Owens Val- ley to 5000 or 5500 feet above Independ- ence. Spring frosts are too frequent for almonds, apricots, and early blooming peaches, but high-winter-chilling varieties of peaches, pears, and apples will usually be satisfactory in the garden. Subzone 3.3 will be too cold for reliable peach and pear production. All ornamentals and gar- den fruits valued for their spring bloom are somewhat unpredictable. Plantclimate Zone 4. Arid-cool temperate valleys and cold-air basins Seven subzones, 4.0 through 4.6, are re- quired to delineate variations found in main valley floors and cold-air basins. The subzones have been divided into two groups — main valleys and high valleys. Main valleys and cold-air basins. Sub- zones 4.0, 4.1, 4.1w, 4.2, 4.3 and 4.3w range in elevation from 2300 to 3500 feet. Growing season varies from 192 to 213 days. Crops of the main valleys, hence choice of ornamentals, are limited by late spring frosts which will damage bloom in many years. Normal winter minimums range from 15 to 20 degrees, with occa- sionally 0 to 10 degrees. Bluegrass will be the dominant lawn grass but Bermuda- grass will survive. These subzones are the upper limit for Forbes cypress (Cupressus forbessi), sev- eral junipers (Juniperus sp.) and pines (Finns sp.), California live oak (Quercus agrifolia), desert willow (Chilopsis lin- earis), oriental sweet gum (Liquidambar orientalis), Chinese elm (Ulmus parvifolia), pampas grass (Cortaderia selloana), ice plant (Mesembryanthemum sp.), lippia i (Phyla nodiflora), European grape (Vitis vinifera), and oleander (Nerinm oleander). \ High elevation valleys and cold-air basins. This section of plantclimate zone 4, namely 4.4, 4.5 and 4.6, ranges in ele- vation from 3200 to 5000 feet. Growing season varies from 150 to 165 days. Nor- mal winter minimum temperatures range from 7 to 15 degrees with occasionally -3 to 5 degrees. Annual flowers should be planted late or given ample protection. Plantclimate Zone 5. Mountains This includes all areas above the esti- mated upper level of deciduous fruits, and varies from 4500 feet in the south to 6200 feet in the north, with some mountains over 10,000 feet. Mountains are all cool temperate, cold temperate, or sub-alpine at the highest peaks. Mountain areas are non-agricultural except for grazing. Sum- mer rains produce fair pasture grass in some areas between 4500 and 8000 feet elevation. Ornamental plantings will be subject to frosts any month, and species should be selected for cold hardiness. There is a surprising number of conifers, deciduous trees and shrubs, vines, and ground-covers suitable to mountain cli- mates. A few examples are giant sequoia (Sequoiadendron giganteum), Japanese flowering quince (Chaenomeles japonica), spiarea (Spiraea sp.), some lilacs (Syringa sp.), Boston ivy (Parthenocissus tribuspi- data), concord grapes (Vitis labrusca), strawberry (Fragaris sp.), and peony (Paeonia sp.). PLANT LISTS Palms, coniferous trees and shrubs, broad- leafed evergreen trees and shrubs, decidu- ous trees and shrubs, vines and ground covers are listed by groups (starting page 24). No attempt has been made to catalog the large number of herbaceous peren- nials such as Bleeding Heart, Daffodil, Tulip, etc., or the annual flowering plants. A wide choice of the latter is available for planting in the many miniclimates (see "Glossary") of a windbreak shelter. Suc- cess depends on understanding their man- agement requirements. Plants listed were actually observed by the authors, and most had been growing satisfactorily in the Middle Elevation Desert for 5 years or more. They are scored in three grades of drought toler- ance: drought tolerant to a high degree, as with desert natives; moderately drought [14 tolerant plants that will use large quan- While the many plants listed provide tities of water if available, but which will considerable choice in landscape effect, do reasonably well on greatly reduced some owners will want to try others. Ex- supplies — olive, oleander, some palms, al- perienced nurserymen in desert areas will mond; not drought tolerant requiring be found to have many new kinds avail- regular irrigation and plenty of water, able — your nurseryman is well aware of such as roses, elms, willows, myrtles, the need to choose and introduce plants privets or spiraea. suitable for such areas. GLOSSARY CALICHE — A soil having rock-like layers, from a few to many inches thick, of sand and gravel cemented together by calcium carbonate. There are extensive areas of this in deserts, usually a few inches to several feet below the surface. Water may pene- trate very slowly, hence the soil above is liable to become saline. Layers will not re-cement if broken. Iron chlorosis is characteristic, even after break-up and the establishment of drainage. CHILLING REQUIREMENT — Most deciduous trees and shrubs (those which are leafless during the winter) and some other temperate zone plants, such as tulips and daffo- dils, require varying amounts of cold temperature during their dormancy to condi- tion them for normal spring growth. Severe lack of winter chilling will result in lack of fruit set and exceedinglv delayed spring development — a condition known as "delayed foliation" or "dormosis." Almonds, apricots, and few peach varieties need but relatively short periods below 45° F and are said to have a low chilling require- ment. Under these conditions lilacs, daffodils, tulips, Japanese flowering quince, and similar plants may not bloom satisfactorily. Most varieties of peaches, pears, cherries, plums, nectarines, some early apples and Placentia and Ehrhardt walnuts can be considered as having a medium or moderate chilling requirement. Under these conditions, lilacs, daffodils, and tulips will be satisfactory. Late apples, peaches, pears, and Eureka and Franquette walnuts have a high chilling require- ment. CULTIVARS — Plant variant, or variety, resulting from induced or natural mutations, hybridization, etc. and maintained only by cultural operations, such as selection, vegetative propagation, roguing, and isolation. DESERT NATIVE — Indigenous or naturally introduced plants that live and thrive in various parts of the Middle Elevation desert. Thev are all significant for their ability to survive on limited, and mostly wintertime, water. Most of them are intolerant of heavy summer watering common to garden irrigation. The desert natives should be planted together and managed as a unit with very limited summer irrigation. All will benefit from deep watering in winter. GROWING SEASON — The frost-free period between spring and fall minimum tem- peratures of 32 degrees. IRON CHLOROSIS — Yellowing of leaf tissue between veins, most noticeable on new growth. In severe cases leaves become almost white, will sunburn and drop. Caused by high lime content of soil preventing the absorption of iron bv the plant. Specially prepared iron can be applied to the soil or used as sprav to correct the trouble. LAWN WATERING — With a sprinkler system a lawn is usuallv watered frequently and with amounts that will penetrate the soil below the grass roots, thus keeping the soils below 6 to 8 inches continually wet. On the other extreme, with hand sprinkling the deeper soils almost always become dry. Both conditions, continuallv wet or ex- tremely dry, are unfavorable for many trees and shrubs with deep root systems. Dif- ferential irrigation between shallow-rooted grasses and deeper-rooted trees and [15] shrubs is essential. This calls for frequent light irrigations of the lawn. Deep soaking 1 to 2 or 3 months apart, depending upon soil and season, will prevent over-irriga- tion of the deep rooted plants. PLANTCLIMATE — A definable phvsical climate distinguishable from others by kinds of plants and their performance, or converselv plant kinds and performance that can be predicted and described from knowledge of the phvsical climate. There are five PLANTCLIMATES which are statewide or larger. Each plantclimate has optimum seasonal conditions for specific plant groupings or associations. These same groupings or associations may be found in other plantclimates, but perform- ance is inhibited to varying degrees because of differences in the phvsical climate. Each major plantclimate is divided into several REGIONAL PLANTCLIMATES within which the groups or associations of plants and their performance are increas- ingly specific. The same regional plantclimates may exist in more than one major plantclimate. Regional plantclimates are composed of PLANTCLIMATE ZONES. A plantclimate zone is a geographical area in which certain rather broad groups of plants having specific climatic (principally temperature) requirements will grow satisfactorily, soil and water assumed favorable. A PLANTCLIMATE SUBZONE is part of a plantclimate zone in which onlv a few kinds and varieties of the general plant group and the physical climate are in complete harmony resulting in consist- ent performance. Within the subzones there are MICRO-plantclimate subzones (or micro-subzones) — small portions of the larger areas that because of exposure or shelter (either natural or man-made) cause a slightly different plant reaction. The differences can be as great as the difference between adjoining subzones, but usu- ally will be less. Micro-subzones vary from a few square miles or less to the area enclosed by an effective windbreak around a homesite. Within these micro-areas are many MINI-plantclimate subzones (mini-subzones). These are small areas of a few square feet, perhaps on the south face of a wall between large sheltering shrubs where reflected heat will accumulate, under an evergreen tree for shade effect, etc. TEMPERATURE — All temperatures are in degrees Fahrenheit, and data are from U. S. Weather Bureau published records. THERMAL ZONE, OR THERMAL — In this publication the term is used to indicate a warm zone or belt on hillsides, slopes, and moderate elevations, from which cold air drains to the lower lying valley floor or cold air basin. Thermal zones are often 5, 10 or 15 degrees warmer than their adjacent low areas. This difference is partic- ularly apparent during spring and fall frost periods. TORNILLO — A small but violent "dust devil," or whirlwind. VARIETY — A plant variant found in the wild. COMMUNITIES VISITED DURING PLANT SURVEY OF MIDDLE ELEVATION DESERT ^ Plantclimate Plantclimate Community . subzone Community subzone Adelanto 4.1 Barstow* 3.1 Apple Valley 4.0 Big Pine 3.3 Antelope Valley Field Station 4.3 Bishop Airport* 4.5 Boron 4.3w Backus Ranch (6 miles Barnhart Nursery (near northwest of Rosamond)* 3.1w Yucca) 2.0 Baker 1.9 [16] Plantclimate _ . Plantclimate Community subzone Community subzone Cantil* 3.1w Morongo Valley 4.0 Chandler's (Holland Summit) 3.1 Mt. Whitney Fish Hatchery 3.2 China Lakef 3.1w Mountain Pass 5.0 Cool Water Ranch (near Daggett) 2.0 Neenach 3.1 Newberry 2.0 Daggett Airport* 2.0 Daggett Marine Base 2.0 Olancha 3.2 Onyx 3.0 Edwards Air Force Base 4.3w Oro Grande 4.3 Fairmont* Frazier Park Fort Tejon Freeman Gulch 3.1 3.1 3.1 3.1w Pahrump Valley* Palmdale* Palmdale Airport* Pearblossom 3.1 3.1 4.3 3.1 Gorman George Air Force Base 3.1 Pearlands Phelan 3.1 3.0 (near Victorville) 4.3 Quail Lake 3.1 Haivvee* 3.1 Quartz Hill 3.1 Hayfield Reservoir* 2.0 Hesperia 3.0 Randsburg* 3.0 Helendale 3.0 Ridgecrest 3.1w Hinkley 2.1 Rosamond 4.3 Holland Summit 3.1 Homestead (Indian Wells) 3.1w Sandberg (old Forestry Hutchinson Nursery Station) 3.1 (near Barstow) 3.1 Shoshone 2.1 Simi Corners 4.3 Independence* 3.2 Indian Wells (Homestead) 3.1w Tehachapi (town)* 4.4 Inyokem* 3.1w Tehachapi (surrounding) 3.3 Three Points 3.1 Jess Ranch (near Apple Trona* 2.1 Valley) 4.0 Twentynine Palms* 2.0 Joshua Tree 4.0 Valyermo 3.1 Lancaster* 4.3 Van Dyke Ranch (near Lebec 3.1 Daggett) 2.0 Leona Valley 4.0 Victorville* 4.3 Littlerock 3.1 Vincent Fire Station 3.1 Llano* 4.3 Llano Shawnee* 3.1 White Water 2.0w Lucerne Valley* 4.2 Willow Springs 3.1 Lone Pine 3.2 Ludlow 2.0 Yermo 2.0 Yucca 2.0 Mojave 4.3 Yucca Grove* 3.2 Monolith 3.2 Yucca Valley 4.0 * Location of U. 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