thee a NES THE ‘‘COUNTRY LIFE "’ LIBRARY THE HARDY FLOWER BOOK Seve FS mt | Sv First Edition, April, 1913. Second Edition (Revised), June, 1914. Ate te 46 COUNTRY HUDSON & KEARNS, Lid.,- ~ LONDON, S.E. in at ¥ Paper - * 4,8. ¥ fe eek Dy FLOWER BOOK By | a JENKINS Edited by bo W. HARVEY SECOND EDITION LONDON : PUBLISHED AT THE OFFICES OF COUNTRY LIFE, LTD., 20, TAVISTOCK STREET, COVENT GARDEN, W.C., AND BY GEORGE NEWNES, LTD., 8-11, SOUTHAMPTON SDREET, STRAND, W.C. NEW YORK: CHARLES SCRIBNER’S SONS. THE HARDY FLOWER BOOK Vil CON FENTS PART I. CHAP. PAGE I.—PREPARATION OF THE SOIL P . : 1 II.— GENERAL CULTIVATION OF HARDY FLOWERS, PLANTING, STAKING, TYING . : ‘ 6 IIl.—HarpbDy FLOWERS FOR THE MIXED BORDER . 13 IV.—HarpDy FLOWERS FOR THE SHRUBBERY BORDER 17 V.—HARDyY PLANTS FOR THE WILD GARDEN : 2A VI.—HarbDy PLANTS FOR WATERSIDE GARDENING =. 27 VII.—Harpy PLants FOR Boip PICTURESQUE EFFECTS : ' : : ‘ ; 37 VIIJ.—Harpy Florists’ FLOWERS : ; = 40 IX.—EFFECTIVE BORDER GROUPING . : : 56 X.—PROPAGATION OF HARDY HERBACEOUS PLANTS O61 XI.—DISEASES AND INSECT PESTS . ; 4 68 PART ii, INTRODUCTION ‘ : ‘ : : : . 71 ALPHABETICAL SELECTION OF THE Most USEFUL AND ORNAMENTAL HERBACEOUS PLANTS . : 72-128 vill CONTENTS PAKS LUE: HARDY FLOWERS FOR VARIOUS PURPOSES i 5 i226) THE BEst BULBOUS AND TUBEROUS-ROOTED PLANTS 132 HARDY FLOWERS THAT BLOOM IN SPRING : RG HARDY FLOWERS THAT BLOOM IN SUMMER . ess HarRDy FLOWERS THAT BLOOM IN AUTUMN . . 237 HARDY FLOWERS THAT BLOOM IN WINTER . _ Way PLANTS FOR FORMING EDGINGS . : ; 6 1rXe} HARDY PLANTS FOR THE SHADY BORDER : a Ege HARDY PLANTS FOR SUNNY BORDERS . ; 5 XO) A SELECTION OF ORNAMENTAL PLANTS FOR PIC- TURESQUE EFFECTS : : . . - £40 Harpy FLOWERS FOR SHOW PURPOS:S . : o Ban \ SELECTION OF HERBACEOUS AND ALPINE PLANTS THAT MAY BE RAISED FROM SEEDS . . 2 ba A SELECTION OF MOISTURE-LOVING PLANTS . la HARDY FERNS FOR THE SERiIJBBERY BORDER OR WOODLAND . < Sseeen ‘ ‘ ; - ele THE HARDY FLOWER BOOK LIST OF ILLUSERATIONS Fic. COLOURED FRONTISPIECE—A JUNE BORDER OF FLAG IRISES AND LUPINES. 1.—A PLANT BADLY STAKED 2.—THE SAME PLANT PROPERLY STAKED 3.—PLAN OF A MIXED BORDER 60FT. LONG AND I2FT. WIDE 4.—A MIXED BORDER IN AUTUMN 5-—A MIxED BORDER WITH ANNUALS IN THE FOREGROUND . . : : : : 6.—JAPANESE ANEMONES EFFECTIVELY GROUPED IN FRONT OF EVERGREENS a 7.—DAFFODILS NATURALISED IN THE WOODLAND . 8.—A Giant Cow-ParsnIpP . 9.—SNOWDROPS IN A WOODLAND CLEARING . 10.—A BoL_p GROUPING OF GERMAN IRISES BY THE WATERSIDE II1.—]JAPANESE IRISES BY THE WATERSIDE AT WISLEY 12.—PLAN SHOWING SECTION OF A DEEP DITCH 13.—PLAN OF A PATHWAY AND STREAM ; 14.—A STREAMSIDE GARDEN THAT HAS BEEN MADE FROM A DeEEp DitTcH. ix PAGE 9 I2 14 x THE HARDY FLOWER BOOK Fic. 15.—ACANTHUS MOLLIS 16.—AN EFFECTIVE GROUPING OF EREMURI . 17.—PHLOXES GROUPED TOGETHER 18.—PHLOXES EFFECTIVELY COMBINED . I9.—PLAN OF BORDER AT WESTWICK GARDENS 20.—A WELL-ARRANGED BORDER . 21.—AN OLD PLANT OF LONDON PRIDE ‘ : 22.—THREE TYPICAL YOUNG SHOOTS OF LONDON PRIDE 23.—AN OLD PLANT oF LYCHNIS . 24.—DIVIDED PorRTIONS OF LYCHNIS 25.—PORTION OF AN. OLD PLANT OF EVERGREEN CANDYTUFT 26.--SHOOT OF EVERGREEN CANDYTUFT. 27.—A BoLp GrouP OF DOUBLE-FLOWERED HOLLY- HOCKS : : : : : : ; 28.—A BED OF THE DROPMORE VARIETY OF ANCHUSA ITALICA 29..—_CUTTINGS OF DOUBLE ARABIS 30.—THE CUTTINGS PLANTED IN A Box 31.—A FLOWERING PLANT OF DOUBLE ARABIS RAISED FROM A CUTTING . 32.—A BoRDER OF MICHAELMAS DAISIES ‘ : 33.—MicHAELMAS Daisy DESIRE 79 81 EVST OF ILLUSTRATIONS Fic. 34.—THE Moccasin FLOWER : : ‘ 35.—A LarGE BED OF THE GIANT ASPHODEL : 36.—CHRISTMAS ROSES WITH HARDY FERNs . A BEAUTIFUL BORDER OF GERMAN OR FLAG 37: IRISES : n ; : - 38.—PORTION OF AN OLD PLANT OF GERMAN IRIS 39.—SINGLE CROWNS OF GERMAN [RIS 40.—A Group oF MADONNA LILIEs : 41.—CLUMP oF LiLty BULBs READY FOR TRANS- PLANTING . : : : 42.—How To ARRANGE LILY BULBS FOR PLANTING . 43.—THE NANKEEN LILY IN A BED OF RHODODEN- DRONS : : - . : 44.—MADONNA LILIES EFFECTIVELY PLANTED BY A Lorry PERGOLA 45.—THE AsIATIC BELL-FLOWER . 46.—ORIENTAL Poppy . : : : 47-—_AN OLD POLYANTHUS PLANT READY FOR DIvIsION 48.—DIVIDED PoRTIONS READY FOR PLANTING A Roor CuttTING oF ROMNEYA COULTERI . 49. 50.— THE LARGE-FLOWERED Woop LILy ; 102 103 105 107 107 THE HARDY FLOWER BOOK Xl PREFACE THE increasing interest that has been taken in the cultivation of hardy herbaceous flowers during the last few years has been phenomenal. Never have they been so highly esteemed as they are at the present day. This fact is due to many causes, the chief of which, un- doubtedly, is the great improvements that have been brought about by our leading nurserymen and amateurs. It is only when a comparison is made between the Delphinium, Peony, Phlox and Pyrethrum of to-day with those in general cultivation ten or fifteen years ago that one realises the extraordinary improvements that have been made, and the effects these have had on garden- ing not only in this, but in other countries. The increased interest in these plants has naturally called forth a number of books professedly dealing with their cultiva- tion. Of these few are good, many indifferent, and a number bad. The chief faults of the majority are that they are indefinite or impractical. In these days there is a noticeable tendency to strain after journalistic effect and to ignore, or pleasantly evade, just those very points upon which the average amateur who sets out to cultivate these flowers is seeking for information. We believe that it is not impossible to successfully combine the two, but we even more firmly believe that sound, practical information is the all-important object to keep in mind, and the contents of this book as well as the illustrations have been prepared with this end continually in view. Mr. Jenkins is a_ recognised authority on all kinds of hardy plants, having devoted his whole life to the study of their requirements. For many years he has been a member of the Floral Committee of the Royal Horticultural Society, has lectured on hardy flowers in all parts of the country, and XIV PREFACE is consulted about hardy plants by both nurserymen and amateurs. Any of the methods advocated in this book, therefore, may be adopted with the fullest confidence. For the sake of convenience and handy reference, the volume has been divided into three distinct sections. Part I. deals with the principal uses of hardy flowers in the garden, and includes special detailed particulars of the more important families, such as Phloxes, Del- phiniums and Pyrethrums, as well as plans showing the proper grouping of plants for borders. Part II. consists of an alphabetical list of all hardy herbaceous flowers that are worth growing. Here will be found in concise form all the essential points that are necessary for their cultivation—the best varieties ; the month of flowering ; soils; aspect required; and propagation hints; par- ticulars which in so many books are either ignored or evaded. Part III. consists of tabulated lists of hardy plants for all conceivable purposes, giving, in every case, their colour, height, time of flowering, and other useful details. An important feature of this section of the book is the lists of plants that flower in all seasons— spring, summer, autumn and winter. Many owners of gardens are able to spend only a few weeks of one or other seasons of the year among their flowers, and, naturally, wish the garden to appear at its best during those weeks. These lists, in conjunction with the in- formation given in the other sections of the book, should enable this object to be achieved without difficulty. It is confidently claimed that this little book is a complete and trustworthy guide to all those who are desirous of adding to their knowledge of the right methods of planting and cultivating hardy flowers, and thereby enhancing the attractiveness and beauty of their gardens. F. W. HARVEY PARAS slr HE HAKDY FLOWER BOOK 1 CHAPTER =I. PREPARATION OF THE SOIL. IN the cultivation of hardy flowers a matter of the highest importance is the tilling of the soil. This applies with equal truth to every class, whether shrub, her- baceous perennial, or biennial, and in the main to the entire range of annuals also. But, despite this truism, it is a matter too often neglected, or the work at least only indifferently performed. If an amateur specialises in Roses or Sweet Peas, the almost invariable rule is to so make a beginning that success at the very outset would appear to be more than half assured. The soil is so thoroughly trenched, manure and bone meal and other things so incorporated, that the operator has the supreme satisfaction of knowing that he is doing the thing rightly and well, and, that being so, he is entitled to look for a fair return for his labours. Generally, he has the even more supreme satisfaction of not being disappointed, and the full measure of his success is the reward of his enthusiasm, of his labour of love. In his first dealings with the hardy herbaceous flower border the amateur is not always so enthusiastic as he is in the case of Roses or Sweet Peas, but the former demand it as much, and repay it as fully as the latter. That being so, I desire on the very threshold of this little volume to drive home the point, to endeavour to get my readers fully to comprehend the importance of thoroughness at the outset. All interested should, therefore, regard the preparation of the soil as a first principle, something which cannot be ignored, something which cannot be gainsaid with impunity. Those who have omitted this important work in the past—and from long experience and touch with horticultural journalism I know the number is not a small one—have many times repented of their sin, and have been freely forgiven by all, probably, save those unoffending A 2 THE HARDY FLOWER BOOK victims, the plants. The greater burden of punishment in such cases falls, usually and happily, in the right place, the indifferent display, the sullenness of certain plants, the death of others, and, over all, an enfeebled growth, insignificant and poor, uncharacteristic flowers being some of the outward and visible signs of this neglect of the preparation of the soil—a first principle in the case. In any case the old adage “ well done is always done’’ must apply, for once a border is well prepared the one great obstacle of non-success is removed. Conversely, “‘ badly done is never done,” and the ill-prepared border is a source of dissatisfaction and an eyesore for long periods of time. Moreover, such border has, sooner or later, to submit to preparation, and, naturally, the deferred work is more costly and less expeditiously performed than if undertaken at first. Obviously then, from the standpoints of economy and insured success, the due preparation of the soil must be regarded as A First Step.—That being so, we may now consider the situation more closely. For treatment, an entirely new piece of ground exists in the mind’s eye. It may be a portion of a shrubbery border, a poaching on the preserves of the kitchen garden proper, or, what often happens, a piece of pastureland is being taken into the garden and awaits treatment. In each of these a different set of conditions arises. Let us take them as we find them. The shrubbery border example will invariably be found in a poor impoverished state owing to long tenure of trees and voracious shrubs. The first thing to do in such a case would be to rid the soil of every vestige of root and root fibre, grubbing them out, and making a bonfire of the materials on the spot, together with any rubbish that might be at hand. The ashes from such fires are rich in ammonia, potash and other salts, and by strewing them evenly over the surface the soil would be receiving, if in a new form, some of the essen- tials of plant life long since removed. Such a border will require the deepest trenching and heaviest manuring to get it into good heart. Should the soil be very light | PREPARATION OG GEE SORE 3 or sandy, cow manure, whether comparatively fresh or well decomposed, will be the best—best, not for high manurial value so much as for its cool, long enduring, moisture-retaining properties. These sandy soils, too, are usually deficient in lime; hence that essential to most vegetable life should be supplied. Even more valuable than lime would be a six-inch surface dressing of lias clay, and which, when broken down by frost and rain, should be thoroughly incorporated with the soil. Such a dressing of clay would, in a single year, more than restore the soil to its original fertility, while making a medium for plant cultivation bordering on the ideal. Heavy or retentive soils would, in addition to trenching, require sand, grit, leaf soil, and light manure to render them porous and open. The drainage, too, should be made perfect. A more efficient aeration of the whole mass of soil would be secured by throwing it roughly in high ridges for the winter, an operation which at once insures a more complete drainage, while exposing its maximum to the re-vitalising influences of frost and air. The Kitchen Border Soil in the ordinary way will be found rich in plant foods, and possibly a thorough trenching, in conjunction with manuring and liming, will be all sufficient. It might be added here that, to ordinary soils, hme might be applied at the rate of one bushel to each rod of ground, and to over-rich soils, those virtually suffering from manure sickness, twice that amount might be advantageously applied. The chief function of lime is that it brings into action the insoluble reserves of nitrogen and potash contained in the soil, rendering them available as plant food. It also constitutes a corrective to soil of much richness by neutralising the injurious acids present. In all cases cow-manure is that recommended for light sandy or stony soils, and ordinary stable dung for heavy soils. Newly Embraced Pasture Land may require special treatment. Of primary importance here would be to determine the presence or absence of wireworm, a ter- rible pest so far as Lilies, Irises, and many other plants are concerned. Should the land be free, trenching and 4 THE HARDY FLOWER BOOK manuring should proceed in the ordinary way. Should its presence be detected, it will be best to take a four- inch deep sod off first—the “ top-spit ’’—and stack it in a place apart. To turn this wireworm infested sod into the bottom of the trench would constitute a fatal error, one that might cost pounds to rectify, and even then not before many valuable plants had been lost. Trenching and Manuring.—Trenching is but another name for double-digging, and consists in the removal of soil two spits deep, with the consequent crumbs. Its special office is to deepen and improve the soil, to render available a greater depth of material, aerated and en- riched to sustain plant life. Soils vary materially in depth as well as quality, and, in the case of shallow soils over gravel, trenching as ordinarily understood is neither practicable nor possible. On the other hand, several feet deep of good soil may exist, and in such as these the trenching should be of the best. The method of trenching is to mark off a strip of ground two feet or so in width, and excavate it to a similar depth. If borders on either side of a main walk are being treated, the soil will need to be transferred only to the opposite side of the border. If a one-sided border is being dealt with it will be best, unless the border is wide and permits of being worked in two longitudinal sections, to transfer the soil to the other extreme. With the first trench open, a width equal to the first should be marked off, turning the top soil into the bottom and bringing the second spit to the top. A heavy layer of manure should be inserted between these two layers of soil. In the case of new or impoverished soil heavy manure dressings should also be given at the surface. The work of trenching should be done in early autumn, where possible, so that the ameliorating effects of frost, rain and air can exert their fullest influence upon the soil. A Final Step in this important matter of soil prepara- tion should be early spring forking or digging. Prior to this, heavy and retentive clay soils will be much improved by a surface dressing of lime, Ib. to the square yard, which, coagulating the particles of the soil, permits PREPATKAIMON OF Die “SOLE 5 a freer passage of water through the whole mass, thereby ensuring a greater degree of warmth and more complete drainage than existed before. The same class of soils can be lightened and otherwise improved and enriched by the addition of ashes from garden rubbish fires, and, whilst the soil is still unoccupied, anything that can be done in this direction should be done. Clay soils, generally, are usually unworkable during times of wet- ness, and if trodden only become pasty and unsuited to plant growth. Hence the need of surface dressings— lime, soot, wood ashes or the like—being given during frosty weather. Advantage, too, should be taken of dry, windy weather for the same work. In extreme instances of clay soils, and where the area is a large one, burning has been resorted to with excellent results ; that is, making a fire and treating the worst of the material as if making a ballast fire. Such work, however, is not possible in restricted areas, though its effect in other circumstances is almost electrical. Soils so treated are benefited for all time. They are drained, warmed and enriched, and much water being taken out of them by the process of digging and burning, they are rendered almost immune from one of the worst evils of all clay soils, viz., summer contraction and cracking. Light soils are much more tractable and easily worked. They do not usually suffer from treading after wet, and, as a rule, are available at any time. They also possess other advantages. Plants take to them more quickly than they do to clay soils. This is chiefly due to the existing warmth created by more complete drainage. At the same time they are more quickly exhausted than heavy soils and require more frequent enriching, and they are available for planting at almost any season. Notwithstanding these advantages, it will be well to give them careful treatment at the start. I have thought it well to refer to the treatment of the soil in some detail, so much evidence having come under my notice of the consequent ill-effects—loss of plants and much disappointment—when the hardy plant border has received but little or no preparation. 6 THE HARDY FLOWER BOOK CHAPIER te GENERAL CULTIVATION OF Harpy FLOWERS. PLANTING, STAKING, TYING. When to Plant.—Of primary importance here is the question of planting in season and with reason. Let it be clearly understood what is meant by this. Her- baceous perennials, like all other subjects, have their own seasons for starting, both with root-activity and stem-growth. Some, too, are almost perpetual in their rooting, continuing to produce root fibres during a greater part of the year. The border Phloxes are an instance of this. Others, however, such as Iris, Peony, and the Christmas Rose, produce root-fibres at fixed intervals of time. The first-named set, those that might be called the perpetual-rooting class, may, if convenient, be planted with impunity over a considerable period. The others—and Peeonies and Christmas Roses more particularly—cannot be so treated, or, if so treated, will resent it in an unmistakable manner. This is due to a variety of circumstances, though chiefly to the fact that only two sets of roots are produced by these plants each year, and the loss of the primary set—the basal roots of autumn—which also entails the loss of the secondary set, appearing normally in spring, the plant is thrown on its own resources for probably a whole year. This in turn gives rise to a general weakness or debility of the whole plant, and recovery is very slow. More of this anon. Autumn and Spring Planting.—In the main, however, that large class of plants which figure under the general heading of hardy herbaceous perennials are of so vigorous and enduring a nature that they submit to planting either in autumn or in spring. A principle involved in the latter, however, is that the work be timely done, so that the subject has the dual advantage COLLIV ATION: PGA NITNG. Gc: 7 of becoming established before dry weather sets in and of making a fair display even in the first year. In a general way the majority transplant quite well just prior to new growth appearing. Larkspurs, Irises, Sun- flowers, Pyrethrums, and many more are good examples, though in light loamy or sandy soils these may also be safely planted at other times, The Herbaceous Phloxes, because of their continuous rooting and the loss of root- fibre and stamina that late planting involves, I prefer to plant in early autumn. In this way the plants obtain a good hold of their new stations before the arrival of spring. The Fallacy of the Big Clump.—Let me emphasise this, because to the beginner there is no more fatal error. The big clump of Pyrethrum, Iris, Peony, Trollius, or what you will, is a delusion and a snare. The youthful plant is capable of much better work. Why? Because its every shoot and bud has oppor- tunities for developing, whilst those of the big clump are hopelessly hemmed in on every side. A big clump of Pyrethrum may have within its half dozen inches five or six dozen shoots, only a tithe of which are free. The remainder are virtually out of court—out of action. A solitary crown of one of these might appear a diminu- tive scrap to plant, but if well rooted, it will, when established, provide the finest display—a whole sheaf of blossoms. The specialist of the perpetual-flowering Carnation or the Chrysanthemum obtains his best re- sults, not by employing the stools of worn-out, or, at least, much exhausted, stock, but from young plants, periodically increased—refreshed, renewed, re-invigo- rated. Is not the lesson an obvious one for us? Is it too much trouble to perpetuate that youthfulness in the hardy plant border by the same or similar means? We must, indeed, do so if our borders are to yield the best they are capable of giving. The day of neglect or of indifference of the herbaceous border is of the past. It is not sufficient to plant, and leave the rest to chance. We must cultivate, and that perpetually, and the harvest. we shall reap will be a harvest of flowers, an enduring 8 THE HARDY FLOWER BOOK feast of weeks, or it may be months—reaping some thirty, some sixty, some a hundredfold—just in propor- tion as our labour has been assiduous and enthusiastic. Fig. 1—A PLANT BADLY STAKED. Staking and Tying are small matters of great impor- tance. They show at once the taste, intelligence, or indifference of the owner. Badly-tied specimens rob the plants of all beauty and charm, and bundle-tied, beesom- like examples are the ugliest of all. Every plant in Nature has a certain more or less well defined contour CULTIVATION, (PLAN TING, “ce. S) of its own ; the aim of the gardener should be to imitate it as nearly as possible. The bundle-tied specimen (Fig. 1) not only destroys all good eftect, but, by excluding light and air, causes the innermost branches to quickly Fig. 2—THE SAME PLANT PROPERLY STA KED decay, and wretched flowers result. In gardens of note, the proper staking of plants receives seasonable as well as intelligent treatment. That is to say, the habit of the plant is anticipated, and a good natural result en- sues (Fig. 2). This is done, say, in the case of certain Michaelmas Daisies, by placing several stakes to each 10 THE HARDY FLOWER BOOK specimen during the early stages of growth, so that with the latter completed, the stakes are quite or nearly obscured from view. A solitary stake to a plant and a tie amidships is wrong and bad—bad in any case, but inexpressibly so in the case of small growing subjects. In staking no stick need reach to a greater height than two-thirds that of the plant. For example, to Dicentra (Dielytra) spectabilis, or the Solomon’s Seal, all the natural arching character of the flowering racemes should be preserved. To tie such as these to straight erect sticks robs the plants of all their natural grace. These plants, however, rarely require staking at all, and are cited merely to illustrate a point. Noble growing subjects like the Kniphofias (Red Hot Pokers), or Lilium giganteum, need never be staked. Lilium Henryi has a characteristic lean or bend of its own, and no thinking gardener will attempt to rob the plant of it. Michaelmas Daisies, of the ericoides or diffusus sets, require but little staking, though where it is done the top-spread of the plants should receive due considera- tion. For such as these it will be necessary to insert the sticks near to the root-stock of the plant, setting them at an outwardly reclining angle to suit the growth of the plant. A golden rule would be never to stake unless it is necessary. Staking should be resorted to in order to preserve, not to mar, beauty. Elegant habited plants—e.g., Heucheras and Columbines—should seldom be staked ; the play of the flowers consequent upon the prevailing breeze but adds to their many graces. En- vironment, however, may in certain instances render staking desirable, and particularly when the position is much exposed. Stakes, too, should be light and ren- dered as inconspicuous as possible. Watering.—This, in the case of spring-planted ex- amples, is a matter of importance, and again, for sub- jects approaching the flowering stage in times of drought. In all cases where necessary the work should be tho- roughly done, a complete saturating of all the surround- ing soil given from the spout of a can, and not dribbled on by means ofa fine rose. In not a few gardens to-day, CUOLTIVATION, PLANTING, ee. 11 standpipes and hose are to be found, though they are certainly not an unmixed blessing. Cold water driven with force on to a plant is bad; it is infinitely worse when squirting is resorted to by the unthinking, and in never-ending quantity. In watering with hose pipe it is not necessary to direct the full force of the water at the middle of a plant. It is the soil that requires saturation, though the plant will be greatly refreshed by a shower bath at the end. Warmed water, 7.e., that exposed to air and light in open tanks, is best, and rain water best of all. BOOK "ER FLOV HARDY 4 EE: 12 ‘AdIM ‘#éI GNV ONOT ‘409 YACUOT GAXIN V AO NVId— Es “Sur . 5