LOOMIS AND HEUER: ROOTING OF CRYTOSTEGIA 11 



girdled" cuttings strikingly increased the number with strong roots as all but 

 one of the 37 cuttings produced roots in this category. 



Thus it appears that girdling to cause formation of large calluses, with great 

 food storage capacity, not only increases the rooting expectancy of cuttings but 

 their speed of rooting and size of roots as well. These conditions also may be 

 improved still further by use of Rootone on the callus at the time the cutting 

 is made. 



Another conclusion that may be drawn from these tests is that summer 

 rooting of "old girdled" cuttings may be as good, if not better, than rooting 

 in cooler weather when a temperature differential may be maintained with 

 bottom heat. 



U. S. Plant Introduction Garden 

 Coconut Grove. Florida 



