Cannas Indoors: Overwatering, Powdery Mildew, and Better Plant Choices

Heather's indoor cannas (apartment) develop brown tips spreading inward, white dust on edges, brown flecking, translucent spots. No visible pests. Same issues with all plants brought in.

Three Problems Diagnosed

1. Overwatering: Brown tips + flecking + translucent spots = edema/root stress from excess water.
2. Powdery mildew: White dust on leaf edges = fungal spores. Cannas are prone in stagnant, humid indoor air.
3. Insufficient light: Cannas need full sun — apartments rarely provide enough.

Immediate Fixes

• Spray Lysol (or neem oil/sulfur fungicide) on all leaf surfaces daily until mildew gone.
• Run fan on low 24/7; lower temp 10°F at night (mimics outdoor diurnal cycle).
• Water only when top 2" soil dry; no standing water.

Long-Term: Grow Apartment-Suitable Plants

Cannas are not houseplants. Search "house plants" + images for low-light tolerant species: Sansevieria, Zamioculcas, Epipremnum, Aglaonema, Spathiphyllum. These thrive in apartments.

Match plant to environment — don't fight it.