Boxwood Decline: Volutella Disease and Root Stress

Boxwoods yellowing over a year likely have volutella, a disease that attacks stressed plants. Boxwoods are shallow-rooted; they drown near downspouts or dry under roof overhangs. Slow-release fertilizers (cottonseed meal, Milorganite, HollyTone) suit them best. Replacement with a similarly sized plant is difficult; consider replacing both.

see Boxwood – Volutella