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In other instances, where it is necessary to screen service buildingsor blank walls of other buildings such quick-growing types of treesand shrubs as the ailanthus, poplars, willows, and elders may be planted.The ailanthus especially is used to form a mass of foliage againstservice buildings and blank walls during the summe rmonths, butthis tree is cut back each year to a height of three or four feet and thenew growth produces the effect during the next year. The fast-growing types of trees and shrubs often used to producequick effects are correspondingly short lived. Those trees and shrubswhich grow rapidly, mature and decay nearly as rapidly. Very fewof these types should be placed in permanent plantings. |
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