Mold/Botrytis in Crowded Cold Greenhouse: Sulfur Spray & Ventilation

Sylvia's pitcher collection in 2×3×5 ft cold greenhouse (Portland, OR) has serious mold from crowding. Has Neem oil; asks if sulfur fungicide is better and whether to drench soil.

Sulfur > Neem

• Sulfur lasts longer, creates hostile environment for spores.
• Ruthlessly cut all dead foliage (mold starts there).
• Inspect rhizome crowns; if infected, unpot, trim affected tissue, saturate with sulfur, repot fresh.
• Spray leaves, crowns, soil surface.

Ventilation

Leave greenhouse partially open—airflow reduces spore spread. Current mild weather helps.