Algae on Sundew Seedlings: Prevention, Peroxide Treatment, and Humidity Dome Use

A grower battles green algae (not slime) on tiny D. capensis seedlings in covered pots. Physan 20 didn't eradicate it. Asks about hydrogen peroxide, vinegar (warned against), and whether domes are necessary for seeds/cuttings.

Prevention Is Best

• Sterilize peat: Wet and microwave until steaming, or steam in pot.
• Soak & drain peat: Leaches nutrients feeding algae.
• Use distilled water only.
• Top-water frequently to wash spores away.
• Cover pots to block light before germination.

Treatment Options (Test First)

• 3% hydrogen peroxide diluted 1:3 with water—test on algae sample.
• Physan 20 / Consan 20 (quaternary ammonium)—follow directions exactly; remove dead algae afterward.
• Vinegar: NOT recommended—kills plants.

Domes: Optional for Tropical Sundew Seeds

Sow uncovered on peat. Less mold, no hardening off needed. Germination slightly slower but more reliable. Spray with fungicide. Sow sparsely for easy separation.

For leaf/root cuttings: dome until roots form, then harden off gradually (prop lid open incrementally).