If gardeners can reach it, they will most likely shear it. They do not mind if it was intended to be a shade tree, a flowering shrub or even a sculptural succulent. Few will take the time to prune and groom properly. Ironically, formal hedges that actually need to be shorn are rarely shorn properly! 

Most of us fortunately are not gardeners, but merely enjoy our gardens. We know the importance of proper pruning, and that various plants need different pruning techniques. The main difficulty is determining which techniques are best for each type of plant in our gardens.

Shearing is primarily for hedges; which by the way, should be slightly narrower up high, and slightly wider down low in order to optimize sun exposure to all parts. Generally, plants that are grown for their flowers, fruit or natural form should not be shorn regularly.

Fruit trees and modern roses need the most specialized pruning while dormant in winter, so are not recommended for ‘low maintenance’ gardening. Their specialized pruning thins out superfluous growth, concentrating resources for fruit and flower production. Pruning also removes suckers (from below graft unions) and the ‘four Ds’; which are Diseased, Damaged, Dying and Dead stems. 

Most trees eventually need some sort of pruning to direct their growth. Limbs that are too low need to be pruned away to maintain adequate clearance from roadways, sidewalks, chimneys, roofs and anything else that they should keep their distance from. Lighting, road signs and views from cars coming out of driveways should not be obstructed. As larger trees mature, they eventually need the attention of professional arborists to maintain their health, stability and structural integrity.

Small trees like Japanese maple, Hollywood juniper and pineapple guava look much better with selective pruning and thinning to expose their natural forms. If they become obtrusive, such trees are very often pruned back for confinement. They should instead be pruned to direct their growth up and out of the way, so that lower obtrusive stems get removed, and upper growth can develop naturally.

Nandina, abelia, various bamboos, old fashioned lilac and other plants that produce new stems from the ground benefit from another type of thinning known as ‘alternating canes’. This involves cutting older canes to the ground as they begin to deteriorate or become overgrown. Alternating canes without any other pruning allows nandina to keep its distinctive foliar texture, and abelia to develop its distinctive arching branch structure.