. The pruning-book; a monograph of the pruning and training of plants as applied to American conditions. Headed-iu plum 198 SOME SPECIFIC ADVICE because the tree will not grow beyond its normalstature. High-trained trees are often practicallylowest-headed. Tillage is as easy about such atree as Fig. 124 as about one like Fig. 125; and. 122. Free-growing i)luin tree. the former will often hold its shape the longer ifproperly pruned. The question of the relation ofmodern tillage of orchards to low heads is dis-cussed in Principles of Fruit-Growing. In regions where tree trunks ar


. The pruning-book; a monograph of the pruning and training of plants as applied to American conditions. Headed-iu plum 198 SOME SPECIFIC ADVICE because the tree will not grow beyond its normalstature. High-trained trees are often practicallylowest-headed. Tillage is as easy about such atree as Fig. 124 as about one like Fig. 125; and. 122. Free-growing i)luin tree. the former will often hold its shape the longer ifproperly pruned. The question of the relation ofmodern tillage of orchards to low heads is dis-cussed in Principles of Fruit-Growing. In regions where tree trunks are apt to sun- HIGH AND LOW HEADS 199 scald, the bodies should be short. In nearly allregions outside of the Atlantic States this dangerthreatens, and it is often serious on the Plainsand westward. Nearly all writers urge shortbodies and low headsfor the Pacific the Plains regions ^^-^^^it is a common prac- ^tice to shade the trunkby some artificialmeans, but it is aquestion if low-head-ing would not be abetter practice. What length oftrunk constitutes ahigh head or a lowone, depends upon thespecies of tree underconsideration. In ap-ple trees it may besaid that a top is high when the branches start not less than five feetabove the ground, and low when they start notover three feet. Pears, peaches and plums are sel-dom started as high a


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