When can you not trim cedar hedges?

During the months of June and July, trim your hedge every time it grows 6” (15 cm). If not trimmed often enough, the situation can quickly get out of control. Keeping the base of the hedge slightly wider than the upper part is recommended to help snow fall more easily to the ground during winter.

What is the best time of year to trim cedar hedges?

The ideal time to trim a cedar hedge is from early to late June, depending on your climate, after the lilacs have finished blooming. At this point, it has pretty much finished growing for the year, but its new growth will still be a lighter green than the previous year's stems.