. Bulletin . e, the type of pruning must be partially influ-enced by the planting distance. When the trees begin to touch atthe tips, a method of heading-back pruning becomes a thinning out with a heading back of the terminals must beadopted. However, even under such conditions, it seems desirableto cut to a strong lateral branch rather than to a bud. Pruning the Sour Cherry This tree is never as vigorous as the sweet cherry tree, andcan usually be depended upon to make a well-shaped tree that islow and spreading. Start the young tree with a low head, follow-ing the modifiedlead
. Bulletin . e, the type of pruning must be partially influ-enced by the planting distance. When the trees begin to touch atthe tips, a method of heading-back pruning becomes a thinning out with a heading back of the terminals must beadopted. However, even under such conditions, it seems desirableto cut to a strong lateral branch rather than to a bud. Pruning the Sour Cherry This tree is never as vigorous as the sweet cherry tree, andcan usually be depended upon to make a well-shaped tree that islow and spreading. Start the young tree with a low head, follow-ing the modifiedleader type oftraining as out-lined for light correc-tive pruning withyoung trees. Keep main scaf-f o1d brancheswell spaced ver-tically. Use thin-ning-out cuts,and where neces-sary to headback place cut ata strong lateralbranch. Theleader branch issuppressed whenlower scaffoldlimbs are wellestablished after 2 or 3 years growth. To do this, the leader is then cut out to a strong lateral scaffold Fig. 22.—Sour cherry branches showing fruitful and unfruitfultypes. Branch 1 is from the interior of the tree and received in-sufficient light. Its growth is slender and 2 and 3 were somewhat more favored in location butare too slender for proper fruitfulness. Branch 4 grew at theoutside of the tree and received ample sunlight. It developedextensive and plump growth of terminal and laterals and fruit-fulness followed. (Courtesy W. F. Rofkar.) 32 Like many other trees, the sour cherry becomes very thick ifallowed to grow in its own way. The lower branches slow up ingrowth while the top ones remain very vigorous, at which time thelow branches first become unfruitful and finally die, while the topbranches remain in a fruitful condition. Thinning-out pruningwill delay this dying of the lower limbs, and if combined with arepression of some of the wayward top branches will keep the treefruitful over a long period. Strong shoots in the top of the tree beg
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