Ideally, hedges should be pruned in late winter, when plants are dormant and haven't produced buds—particularly if you're cutting back drastically. "You don't want them to break bud before you prune because you want the plant's energy to go toward producing new growth where you want it," says Roger.

When should you not cut hedges?

We recommend avoiding hedge cutting during the main breeding season for nesting birds, which usually runs throughout March to August each year. This can be weather dependent and some birds may nest outside this period, so it is important to always check carefully for active nests prior to cutting.

When should overgrown hedges be trimmed?

In early to mid-spring, cut the height of your hedge back by up to a third. Prune some of the side branches right back to the leader and leave others uncut. Doing this will encourage growth by letting light and air into the plant, allowing the remaining stems to branch out.