Caring for Boxwood

Boxwood has moderate water needs but dislikes both drought and waterlogging. Water regularly during dry spells in spring and summer, particularly for plants in containers or shallow chalky soils. In autumn and winter, established plants rarely need supplementary watering unless conditions are exceptionally dry. Mulch annually in early spring with well-rotted compost or bark to conserve moisture and improve soil structure. Feed in March or April with a balanced slow-release fertiliser or a generous mulch of garden compost. Avoid high-nitrogen feeds late in the season, as soft autumn growth is more susceptible to frost and disease. Container-grown boxwood benefits from a second, lighter feed in early summer. Box blight (*Cylindrocladium buxicola* and *Volutella buxi*) is the most serious problem facing boxwood today. Symptoms include brown leaf spots, blackened stems, and rapid defoliation. Remove and destroy affected material immediately—do not compost it. Improve air circulation by thinning dense growth and avoid overhead watering, which spreads spores. Disinfect tools between cuts. Some gardeners choose resistant species such as *Ilex crenata* as an alternative. Boxwood is also prone to boxwood psyllid, which causes leaves to cup and yellow in spring, and the caterpillars of box tree moth, which can defoliate plants rapidly. Inspect regularly from late March onwards and pick off caterpillars by hand or use a suitable biological control. Overwintering is straightforward—boxwood is fully hardy in zones 5a–8b and requires no protection, though container plants benefit from wrapping pots in bubble wrap during severe frosts to protect roots.