. Cacti. Cactus. CIRCULAR No. 66 JUNE, 1929 UNITED STATES DEPARTMENT OF AGRICULTURE WASHINGTON, D. CACTI1 By David Griffiths, Senior Horticulturist, Office of Horticultural Crops and Diseases, Bureau of Plant Industry, and Charles Henry Thompson, formerly Assistant Botanist, Missouri Botanical Garden CONTENTS Introduction Propagation From seeds Vegetative propagation. Grafting Culture Diseases Insect pests Economic value Medicines Garden vegetable Cactus candy Fruits Page 1 3 9 10 10 10 11 11 11 Page Economic value—Continued. Wood 13 Hedges 13 Decorative value 14 Single-plant displays 16 G
. Cacti. Cactus. CIRCULAR No. 66 JUNE, 1929 UNITED STATES DEPARTMENT OF AGRICULTURE WASHINGTON, D. CACTI1 By David Griffiths, Senior Horticulturist, Office of Horticultural Crops and Diseases, Bureau of Plant Industry, and Charles Henry Thompson, formerly Assistant Botanist, Missouri Botanical Garden CONTENTS Introduction Propagation From seeds Vegetative propagation. Grafting Culture Diseases Insect pests Economic value Medicines Garden vegetable Cactus candy Fruits Page 1 3 9 10 10 10 11 11 11 Page Economic value—Continued. Wood 13 Hedges 13 Decorative value 14 Single-plant displays 16 Groupings 16 Plantings in open ground 17 Peculiarities of cacti 18 Attractive investigations with cactus subjects 19 Cultivated forms 21 Literature cited 24 INTRODUCTION Popular interest in cacti appears to be periodical. Prior to and during 1912 there was a demand for information on this group of plants, but since 1915 there has been a quiescent period until during the last year or two, when there has been a revival of interest which bids fair to become increasingly important. Already cactus collec- tions are being assembled rather numerously, and high prices are being paid for choice specimens. The horticultural trade journals are beginning to reflect the interest, and advertisements of new com- panies and new collectors are appearing. How far the movement will proceed can not be foretold. There is a large cactus flora in the United States, and these mate- rials are the ones now most prominently employed. The restrictions on the importation of plant material from Mexico, the cactus region par excellence, may have a decided influence on the development of the business. The interest in cacti is by no means confined to the United States. Already European nurserymen are inquiring about sources of supplies of seeds, cuttings, and plants in quantities. On account of the 10 or more years of comparative neglect, there are no commercial collections of importance. The collectors get w
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Keywords: ., bookauthorgri, bookcentury1900, bookdecade1920, booksubjectcactus
