How-to Guide
Growing and Pruning Boxwood (Buxus)
The short answer
Boxwood (Buxus) needs well-drained soil and will not tolerate constantly moist sites; it prefers a pH of 6.5 to 7.2 and a location with some afternoon shade. Work organic matter into the whole bed, not just the planting hole.
Prune by thinning, removing whole stems at their attachment point, and shear in early June, never after mid-August, so new growth hardens before frost. Space plants so branches do not overlap, which improves airflow and helps prevent boxwood blight.
Planting and spacing
- Soil: well-drained, pH 6.5 to 7.2; never constantly wet
- Light: some afternoon shade is ideal
- Amend the whole bed with organic matter, not just the hole
- Space plants so adjacent branches do not overlap, for airflow and blight prevention
Pruning basics and timing
- 1Thin, don't just shear — The best method is thinning: remove entire stems or branches at their point of attachment to open up the plant.
- 2Shear in early June — Shear in early June; do not shear after mid-August, or new growth will not harden off before frost.
Winter burn and blight
Winter burn turns leaves bronze to reddish-brown when cold, dry winds pull water from foliage faster than frozen roots can replace it; reduce it by siting plants in partial shade sheltered from winter wind, or with a burlap barrier on the windward side. Boxwood blight shows as brown leaf spots that merge, browning and dropping leaves; wide spacing and good airflow lower the risk.
→ Boxwood is commonly listed as toxic to pets; check ASPCA or your Extension office before planting where animals browse.
Sources
Reviewed 2026-07-18. We cite university Extension, government, and established horticultural sources — and never invent pesticide rates or dangerous treatments.
- Clemson HGIC — Boxwood — Well-drained soil, pH 6.5-7.2, afternoon shade, amend whole bed, thinning pruning, shear early June not after mid-August, space to avoid overlap.
- Wisconsin Horticulture Extension — Winter Burn — Winter burn cause and reduction via sheltered siting and burlap barriers.
- Wisconsin Horticulture Extension — Boxwood Blight — Blight symptoms and spacing plants for airflow to reduce risk.