Her Boxwoods Were Turning Brown. The Way They’d Been Trimmed May Explain Why

A row of established boxwoods had started turning yellow and brown during a hot Pacific Northwest summer. Reddit user u/run_nurse_run had moved into the house a couple of months earlier and was watering the shrubs twice a week, but wanted to know whether the discoloration meant they needed more water.

Several responses pointed to the hedge itself. The boxwoods had been cut into dense rectangular forms, and one landscaper said years of repeated shearing could be contributing to the problem along with sun exposure. Other gardeners who had grown boxwoods recommended fewer cuts and a less rigid shape.

Tight Shearing May Have Contributed to the Browning

u/herrron, who said landscaping is their profession, identified the shrubs as Buxus sempervirens. They suspected direct sun was contributing to the discoloration and said the shrubs still needed water during the dry season, but more water alone might not solve the problem.

They also pointed to repeated shearing. Cutting boxwoods into dense forms creates thousands of heading cuts and thick exterior growth that limits light inside the shrubs. Their recommendation was one shear on a cool, damp day in April or May, removing the previous year’s growth instead of shearing the hedge two to four times during summer. Hot, sunny days should be avoided when cutting.

Other Boxwood Owners Recommended a Looser Shape

u/NixyVixy had similar established boxwoods in the PNW. After an old tree was removed, the shrubs received more sun and several turned yellow during the first year. They recovered, and the owner said they had gone almost a decade without another trim.

u/sullimareddit recommended pruning individual stems by hand instead of shearing the entire surface. Removing selected stems opens spaces for light inside the shrub and produces a rounder form instead of the dense rectangular hedge shown in the photo.

Not everyone agreed that sun and shearing explained the discoloration. Other commenters suggested drought stress, scorch after trimming, mites, or disease, so the photo alone could not establish a single cause.

Image credit: Reddit user u/run_nurse_run