UNITED STATES DEPARTMENT OF AGRICULTURE 
DEPARTMENT BULLETIN No. 1462 
Washington, D. C. 
December, 1926 
AMERICAN BULBS UNDER GLASS 
By David Griffiths, Horticulturist, Office of Horticulture, Bureau of Plant 
Industry 
CONTENTS 
Tage 
Introduction 1 
Tulips 2 
Effect of cutting blossoms 4 
Care necessary in handling 4 
Dates of flowering 6 
Maintenance of quality in stocks 6 
Daffodils 7 
Sir Watkin 7 
Spurius or Trumpet Major 8 
King Alfred 10 
Double Campernelle 11 
Victoria 11 
Golden Spur 12 
Paperwhite Grandiflora 12 
Chinese sacred lily 14 
Page 
Lilies 15 
The Regal lily 15 
The Easter lily 16 
The Madonna lily 17 
Lilium umbellatum 17 
Muscari (grape hyacintb) 17 
Crocus 18 
Antholyza and Watsonia 18 
Hyacinths 18 
Iris 19 
Diseases, pests, and unfavorable con- 
ditions 20 
Conclusions 22 
INTRODUCTION 
Both commercial and private experiences with American-pro- 
duced bulbous stocks have been varied and often contradictory. 
This is not surprising when one considers the immensity of the 
undertaking upon which the growers have but recently ventured 
and the paucity of experience and information available to guide 
them. 
There has been some confusion owing to a misinterpretation of 
results obtained under glass. An unsatisfactory experience with 
domestic stocks has sometimes been interpreted as a demonstration 
that these stocks could not be produced in America, whereas nothing 
was really demonstrated but the fact that the particular stocks 
worked with were unfit, because of various causes which could not 
be explained. 
This bulletin is an effort at a clarification of the situation. It is 
an effort to determine whether the bulb stocks grown in various 
portions of this country force satisfactorily, to determine their short- 
comings, and to offer suggestions for their improvement. 
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