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What does the coating look like, and what's the air around the plant like?

Rex begonias are famously prone to powdery mildew — the pattern tells you how far along it is.

What does the coating look like, and what's the air around the plant like?

Dusty white circular patches on leaves and stems→Gray fuzzy mold on soft, collapsing areas→

Read the full Rex Begonia care guide →

Reviewed June 2026 · how we check this