Bui. 1477, U. S. Dept. of Agriculture 
Plate 29 
Growth and Fruit-Spur Development of the Jefferson Plum 
in Relation to Pruning and to Soil and Other Conditions 
A.— A 15-year-old tree growing in fertile irrigated soil. The top has been kept open 
by regular thinning out and light heading back. A thrifty growth of spurs has 
been maintained throughout. The new shoots are not numerous. (Linden, 
Calif., July 12, 1924) 
B.— Spurs from a thrifty and prolific tree which has been moderately cut back and 
thinned out each year. The tree grew in deep irrigated soil 
C. — A 16-year-old tree growing in fertile irrigated soil. The new growth has been 
severely headed back and thinned out each winter, but scattered fruit spins 
remain. (Compare with D. Niles, Calif.) 
D. — Fruiting branches of an old tree which has been thinned out but only lightly 
headed back in winter. (Compare with C. Courtland, Calif.) 
