October 1960, Volume 39, Number 4 195

~GAZINE AMERICAN HORTICULTURAL SOCIETY A union of the AmeTican HOTticultuTal Societ~ and the American HOTticultural Counczl 1600 BLADENSBURG ROAD, NORTHEAST. WASHINGTON 2, D. C. For United Horticulture *** to accumulate, increase, and disseminate horticultural inforrY?ation B. Y. MORRISON, Editor Directo?-s Terms ExpiTing 1960 JAMES R. HARLOW, Managing Editor DONOVAN S. CORRELL Texas Editorial Committee CARL ,,yo fENNINGER Pennsylvania W. H. HOOGE, Chairman W. H. HOOGE Pennsylvania JOHN L. CREECH A. J. IRVING fREDERIC P. LEE New York WILLIAM C. STEERE CONRAD B. LINK New York CURTIS MAY Terms Expiring 1961 FREDERICK G MEYER STUART M. ARMSTRONG \,yI LBUR H. YOUNGMAN Maryland JOH N L. CREECH Maryland Officers WILLIAM H. fREDERICK, JR. Delawm-e PRESIDENT fRANCIS PATTESON-KNIGHT RICHARD P. WHITE Virginia Washington, D. C. Massachusetts FIRST VICE-PRESIDENT Terms Expiring 1962 DONALD WYMAN Jamaica Plain, Massachusetts FREDERIC P. LEE Mm-yland SECOND VICE-PRESIDENT HENRY T. SKINNER District of Columbia STUART M. ARMSTRONG Silver Spring, Maryland GEORGE H. SPALDING Califomia RICHARD P. WHITE SECRETARY-TREASURER Dist,-ict of Columbia OLIVE E. WEATHERELL ANNE WERTSNER WOOD Washington, D. C. Pennsylvania The AmeTicol7 HorlirllllliTal Magazine is the official publication of the American Hortic.ultural Society and is issued four times a year during the quarters commencing with January. AprIl, J~d y and October. It is devoted to the dissemination of knowledge in the science and art of groWIng ornamental plants, fru its, vegetables, and related subjects. Original papers increasing the historical, varietal, and cultural knowledges of plant materials of economic and aesthetic importance are welcomed and will be published as early as possible. The Chairman of the Editorial Committee should be consulted for manuscript specifications. Reprints, saddle-stapled, will be furnished in accordance with the following schedule of prices, plus postage, and should be ordered at the time the gal,ley proof is retuofl'led by the author: One hundred copies-2 pp $6.60; 4 pp $12.10; R pp $25.30; 12 pp $36.30; 'Covers $12.10. Entered as second class matter in the post office at Baltimore. Tvfaryland, in accordance with (Il e Act of August 24. 19 12. Additional entry for Washington, D.C., was authorized July IS, 1955, in accordance wilh the pro visions of Senion 132. 122 . Postal Manll::tl. A subscription to The American Horticu,ltu.ral Magazine is included as a benefit of membership in the AIlHTira n H orticu ltural Sooiety. lndiviuua l Membership dues heing $6.00 a year. OCTOBER. 1960 THE ~.ER.ICA.N I FORMERLY THE NATIONAL HORTICULTURAL MAGAZINE VOLUi\IIE 39 • I UMBER 4 Contents T h e Gotelli Arboretum of Dwarf a nd Slow Growing Conifers 'VVILLIAM T. GOTELLI ________________________ _______________________________ ____________ ____ ___ __________ 185 A dventures with H ardy, H erbaceous Hibiscus. C. S. KENNE DY ____________________ 199 A New Plant H ardiness Map For the United States and Southern Canada. H ENRY T. SKINNER ________________ ____ __ _____________________________________________________________ ______ 204 Some Moraeas for Southwest Gardens. L. T. P EERY __________________________ _______ _____ 206 Snapdragons for G ardens, Greenhouses, and R esear ch. 'i!\T. J. HANEY ________ 213 The Yellowgroove Bamboo. 'i'V. H . HODGE _______________ _________________________________________ 216 A Book or Two ____ ________________________________ _____ .. ______________ . ____________________________________________ 224 The Gardeners' Pocketbook. Two Unusual Hoyas. \iV. H . HODGE ___________________________________________________________ 230 Nymphaea 'Bob Trickett.' GEORGE H . PRI NG ______ . _________________________________ 233 lVIy Experience \iV ith Gloriosa. lVIAUD R. J ACOBS _____ _____ __ __ . ___________________ 233 Kaemp£eria, Again. B. Y. MORRISON ________________________________________________________ ___ 234 On the Distribution of L OTopeta lu,'m ch inense. JOHN L. CREECH __________ 236 Allegh en y P ach ysandra as a Groundcover. D. G. H UTTLESTON __ ___ ______ 236 H ab?"anthus TObustt~s. B. Y. MORRISON _____________ __________________________________________ 238 Two Zephyranthes New H ere. B. Y. MORRISON _________________________________ . ____ 238 I ncl ex to Vol u me 3 9 _________ __ ___________________________________________________________________________________ 24 1 OCTOBER COVER I LLUSTRATlO:-l (.T. ANLIKFR) Lo-ropetalul11 chinense . .. it highly desirable 1900 plant introduction from Europe, although very rarely seen in nurseries or private plantings . a Chinese native . bLlt are the ten specimens in J apan forgotten introductions' . See Page 236 COjJ)1 1"ight 1960 b'), The Americal1 Horticultllral Soc iely} Inc. G. HAMPFLER An "infra-red" view of the Gotelli Arboretmn A lively contmst in co lor is shown betw een the new gwwth anel olel foliage elw"ing May anel Jwu 1I The Gotelli Arboretum of Dwarf and Slow Growing Conifers \ IVILLIAi\.f T. G OTELLl '" Gardening h as been my h obby since densis Cole's Pros trate, and the Pyg my 194 1. As I read about co nifers, gradu Deodar Cedar, CedTus deoclam P ygmaea, ally my interes ts turned to growing the grow not more than a few inches, some dwarf and slow growing kinds. Search times n o t more than one-quarter inch ing for these little conifers has led m e to per year. In the acre and a h alf I de the four corners of the globe. I have vote to these plan ts, space is an impor done business with over two hundred tant fac tor. 1 have, however, brought and fifty nurseries and met a hos t of peo together nea rl y six hundred kinds, all ple, many of whom I cherish as friends. hardy in m y garden. I have been well repaid, I feel, for these Dwarf and slow-growing conifers may efforts, especially so when a rare little arise na turally in several ways. Mos t of gem is found. the d'war f kinds of Norway Spruce, some In my arboretum I concentra te only in of the pines and junipers originate from growing those kinds tha t are n a turally a "witches broom," a kind of na tural slow growing and the true dwarfs, in monstrosity commonly found on isolated preference to artificially produced branches of conifers. In trees with dwarfs, such as bonsai. The term "dwarf" wi tches broom, the affected branch de is relative, and as used more broadly re velops abnormally and appears twisted, fe rs also to kinds that are not truly contorted and o therwise gro tesque with dwarf. Gotelli's 'Weeping Blue Spruce, very dense gr owth. Cuttings taken from Picea pwngens Gotelli's W eeping, 'Weep this abnormal growth u sually produce a ing J apanese Red Pine; Pinus clensiflon! dvvarE plant. \!\'eeping forms in spruces Pendula, and the Dwarf Hinoki Cypress, and some other co nifers arise as hud Chamaecyparis ob tusa N ana Gracilis, sports on isolated branches of the mother attain after some years a height or spread plant. True dwarfs sometimes arise as beyond that expected of true dwarfs, and seedlings, such as the Pygmy D eodar these kinds usually produce more growth Cedar, CedTus deodara Pygmaea, Dwarf p er year than the true dwarfs. The true Douglas Fit', Pseudotmga menziesi Com dwarf conifers, su ch as the Spreading p acta, and the Spreading Omor ika H emlock, Tsuga canadensis Minuta, Spruce, Picea omoTilw Expansa; others Cole's Prostrate H emlock, T suga cana- also are known to arise as seedlings. Pm pa ga tion: Dwarf conifers to be per petuated are bes t propagated by cu ttings • At his home at 66 Crest Drive, South Orange, N . J" Mr. Gotelli has assembled perhaps the most remarkable or by grafting. R eproduction from cut collection of dwarf and slow growing conifers in the U nited States. The site of the garden as it stands on tings is by far the bes t m ethod, since the the cres t of a ri dge, \vithin sight of the M a nh a~ta n sky plant will always maintain its true char Hn e, is a point favoring the gro'w th of his conifers, as M r. Gotelli points out. Not only is h e an indefatigable acter as a dwarf. Grafting should be dis coll ector, but the skill used in growing these plants is such as to bring every pl ant in LO its full beauty as a coUl-aged, since the stronger understock garden ornament a nd as a cho ice specimen . Mr. Go will frequently force more vigorou s telli demonstrates beyond a ll reasonable doubt the sing ular effecti veness of dwa rf coni fers in a landscape growth from the dwarf scion to nullify p lanting. T he matter of obtain ing d wad and slow growing the desired dwarf ch aracter. conifers in this counlry is th e major deterrent at this C u l t~ br e : lime of these plants becoming popular. Mr. Gotelli is The dwarf and slow growing unabl e to recommend any parti cular nursery in this conifers have been easy to grow, a r eason country that specia lizes in dwarf co nifers; as a matter of fact, mos t nurseri es have nonc to sell and some perhaps for my co ntinued interest in stock a few kinds. To bu y named va ri eti es without 8-eei ng them fi rst is sometimes very dangerous, for you these plants. Generally speaking, all never kn ow exactl y what to ex pect. T he names are fre kinds I h ave grown respond equally to qucntly incorrect which brings this aspect often into a Slate of confusion. the same cuI tural trea tmen [s. I have r1 85] Tsuga canadensis 'Russi' This specimen of th e H uss Twiggy H em lock is abOtlt five fee t h igh and well over fifty years old .

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