Troubleshooting
Begonia grandis problems — and how to fix them
Begonia grandis (Begonia grandis) is generally forgiving once you match its basics, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Powdery mildew
White powdery film on leaves in humid, still air or late season; improve air circulation and avoid wetting foliage.
Tuber rot in winter
Soggy, poorly drained soil over winter rots the dormant tubers; ensure sharp drainage or mulch heavily in marginal zones.
Slow or late emergence
Hardy begonia breaks dormancy very late in spring; gardeners often assume it has died. Mark its position and be patient.
Leaf scorch
Brown crisped leaf edges from too much direct sun or dry wind; move to dappled shade and keep soil evenly moist.
Prevent begonia grandis problems before they start
Most begonia grandis issues are care-mismatch, not bad luck. Dial in the basics:
Looking for the species overview? Begonia — the full care guide.
Begonia grandis varieties: common problems
Begonia grandis problems — FAQ
Why is my begonia grandis powdery mildew?
White powdery film on leaves in humid, still air or late season; improve air circulation and avoid wetting foliage.
Why is my begonia grandis tuber rot in winter?
Soggy, poorly drained soil over winter rots the dormant tubers; ensure sharp drainage or mulch heavily in marginal zones.
Why is my begonia grandis slow or late emergence?
Hardy begonia breaks dormancy very late in spring; gardeners often assume it has died. Mark its position and be patient.
Why is my begonia grandis leaf scorch?
Brown crisped leaf edges from too much direct sun or dry wind; move to dappled shade and keep soil evenly moist.