Venus Flytrap Summer Leaves, Water Quality, and Pot Size: Diagnosing Yellow/Brown Margins

Jarob's Venus flytrap developed long petioles, traps closing tighter, yellow/brown leaf margins (not spreading), in a small pot with rainwater from roof. 4–6 hrs direct sun. Repotted in Canadian peat/perlite.

Long Petioles = Normal Summer Growth

Midsummer Dionaea produces upright, narrow-petioled leaves to maximize light capture. Red trap interiors = light is sufficient. This is not a problem.

Brown Margins: Likely Water Quality

Roof runoff often contains zinc (from galvanized flashing/moss inhibitors), copper, or asphalt contaminants. These accumulate in peat, causing marginal burn. Switch to distilled, RO, or open-collection rainwater. Improvement seen in 2–3 weeks.

Pot Size Matters

"Very small pot" = rapid drying, temperature swings, mineral concentration. Minimum 5" diameter, preferably taller (6–8") for moisture stability. Repot if needed.

Water Tray Depth

Photo showed pot in deep cup with water near rim. Water should be ≤1/4 pot height. Deep water = root rot risk. Use shallow, wide tray.

Overall Assessment

Plant looks healthy: good trap formation, new growth. Fix water source and pot/tray, and marginal burn should stop. No pests evident.