Hedges

The best time to trim hedges depends on the species of shrub and the purpose of trimming
Here are some general guidelines:

For non-flowering hedges, trim every 6 to 8 weeks during the growing season, and less frequently as the weather cools.

For flowering shrubs, time the trimming so it doesn't interfere with their bloom cycle.

Late winter or early spring, before new growth begins, is the best time for trimming or pruning hedges.

For formative pruning, prune in spring after planting and continue to do this during the first two years after planting. For maintenance pruning, trim during summer if you want to get woodier and less dense hedges. Trim in late spring or early summer if you want to target new growths.

Maintenance trimming is usually carried out once a year for informal hedges and twice for formal ones. However, there are certain hedges which might require three cuts a year. It's usually done sometime between spring and summer.