Question: Grey mold on moss in my D. capensis terrarium. Tried Physan 20 (quaternary ammonium) but worried about buildup and plant safety. Tank hits 32°C; fans reduce humidity. Plants on a dim windowsill lost dew. What to do?
Answer: Stop using Physan 20 on sundews—it burns their leaves (like bleach). Use sulfur-based fungicide (e.g., Safer brand) instead; it's safe and acidifies the environment against fungus.
Better yet: grow without a terrarium. D. capensis adapts to lower humidity. Dew production is driven by light, not humidity. A sunny south/west windowsill provides UV that kills spores. Terrariums cause heat buildup, poor airflow, and fungus.
See tropical sundew care sheet.
Happy growing!
— Jacob Farin
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