Bui. 1477, U. S. Dept. of Agriculture 
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Growth Response of Giant Plum Trees to Pruning and to Soil and 
Other Conditions 
A. — Trees 13 years old which have not been pruned for 10 years except for the removal of an 
occasional branch. They produce good and regular crops of moderate-sized fruit. The 
soil is fertile and the orchard under irrigation. (Newcastle, Calif.) 
B.— A thrifty irrigated tree on which the 1-year-old shoots have been headed back each 
winter to insure large fruit. Note the heavy growth of new shoots and also fruiting 
branches and twigs throughout the tree. (Newcastle, Calif.) 
C— Giant plum grafts top-worked on apricot. The orchard is not irrigated, but the soil is 
deep and fertile. ADnual heading back was practiced until one year ago, when little 
or no pruning was done. Note the short wood growth which was made last year; also 
lack of fruiting wood in the older part of the tree. (Vacaville, Calif.) 
