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D-4andD-5 These illustrate incorrect methods of pruning known as the inverted pyramidalcross section and the inverted cone cross section, both of which methods resultingin a wide top and a narrow base in the cross section of the hedge produce a bareeffect at the base and give little foliage. 24
Plate V. The correct pruning of trees and shrubs is a great factor in thesuccessful maintenance of landscape plantings. These diagrammatic drawings,together with the explanations on the opposite page, illustrate correct and in-correct methods of pruning There are two types of shrubs (Chapter XLII-A, Page 296), one of whichis the spring or early-flowering shrubs, such as Van Houtte's spirea,weigela, snowball, and most golden-bells, producing flowers on woodformed during the previous year. The other type consists of plantswhich produce flowers during the late summer and fall on the growthof the current year. This type includes the rose of Sharon, thehydrangea, and the common elder. The general rule for the pruningof flowering trees and shrubs, in order to encourage the development ofmore flowers, is to prune soon after flowering. Unless one has a defi-nite knowledge of shrubs, this rule should be applied literally. Theother rule is that spring-flowering shrubs should be pruned in the earlysummer immediately after they are through flowering, and the summer-flowering shrubs can be pruned to the best advantage in the latewinter and early spring before growth has commenced, to avoid thepossibilities of winter-killing. Lilacs also should be pruned during,the early part of the summer and shortly after the blooming period iscomplete and in every instance before the seed pods have formed. |
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