Avoid trimming hedges in late summer or early fall, as this can harm new growth before winter. Freshly cut hedges are more vulnerable to cold temperatures, which can lead to dieback and other issues.

When to cut: The best time to cut back ornamental grasses is in spring when plants prepare to green up, but warm-season grasses can also be pruned during their fall and winter dormancy. Remove ...

With a good pruning schedule you can keep hedges under control without too much effort. Most evergreen formal hedges like to be trimmed two or three times a year, while they're actively growing.