Boston Fern Diseases: Root Rot, Blight, and Cultural Problems

Watering Issues

Over- or underwatering causes problems. Keep soil constantly moist but not waterlogged. Water thoroughly when topsoil is dry until it drains from bottom. Wait until surface is dry before watering again.

Common Problems

• Graying: Drought stress—leaves turn gray, growth stops. Increase irrigation.
• Weak fronds: Insufficient light (need ≥2 hrs indirect light year-round). Fronds become long and pendulous. Increase light.

Diseases

• Pythium root rot: Gray fronds, wilting, stunted growth. Roots brown and stunted. Prevent with disease-free plants and pathogen-free potting soil. Chemical controls available.
• Rhizoctonia aerial blight: Dark lesions rapidly spreading on foliage and roots; brown web-like mycelium. Treat soil and plant with appropriate chemicals.