This guide to hedge-trimming comes from The Pruning Answer Book by Lewis Hill and Penelope O’Sullivan. Q: What’s the correct way to shear a formal hedge? A: The amount of shearing depends upon the specific plant and whether the hedge is formal or informal. You’ll need to trim an informal hedge only once or twice a year, although more vigorous growers, such as privet and ninebark, may need additional clippings.
The gardener’s work, in almost every thing he does, is to co-operate with Nature. To the extent he learns how to do this, his efforts will be rewarded by success. His problem really is to discover the things he can do that will actually be working with nature, and not counter to her way of doing things. The “improving on nature” which one hears much about is in reality merely lending her a helping hand, by following the tips she herself gives. When we interpret these tips correctly and are guided accordingly, it means successful gardening.