224 PRACTICAL PLANT PROPAGATION 



VITIS Continued 



until the sap flows, the stocks may be grafted after the buds burst. 

 This will eliminate the excess bleeding. The European Grape is 

 usually grafted on American stocks because of its susceptibility to 

 root louse injury. After grafting very early in Spring or in Autumn 

 Mr. Fuller* suggests protecting the cion from frost by covering 

 with an inverted flower pot and straw. 



LAYERS. The simplest method of propagating is by continuous 

 layers. Bend down a cane and cover a few inches deep with soil. 

 Nearly all the nodes will root. Practiced in Autumn or Spring. 



WISTARIA. (Also spelled Wisteria.) 



SEEDS. Grow readily but do not reproduce varieties. 



CUTTINGS. Ripened wood rooted under glass. 



ROOT CUTTINGS. One inch or more long. 



LAYERS. Easily rooted. 



GRAFTING. Horticultural varieties grafted on W. frutescens. 



XANTHOCERAS. 



SEEDS. Few produced but usually all grow if sown in greenhouse or 



stratified over Winter. 

 ROOT CUTTINGS. Cut into three-inch pieces in Autumn and store 



in sand until February, then place where they may start into 



growth with a light bottom heat. 



XANTHORRHIZA. Shrubby YeUow-Root. (Also spelled Zanthorr 



hiza.) 

 SEEDS. Sow in Autumn or early Spring. Seedlings are weak when 



young. 

 ROOT DIVISIONS. In Autumn or Early Spring. 



XANTHOXYLUM. Prickly Ash. Toothache Tree. (Also spelled 



Zanthoxy lum . ) 

 SEEDS. 

 ROOT CUTTINGS. Easiest method. 



YUCCA. 



SEEDS. Flower in 5-6 years. 

 OFFSETS. Flower in three years. 



ROOT CUTTINGS. Cut up thick roots into two-inch pieces, place one 

 to two inches deep. 



ZELKOVA. Siberian Elm. 

 LAYERS. 

 GRAFTING. Use Elm as stock. 



* Fuller. A. S. Grape Culturist. 



