Mini Roses Indoors: Powdery Mildew Requires Light, Air, and Fungicide

Why They Failed Inside

Roses need 6+ hours direct sun, good airflow, and low humidity. Indoors, they get weak light, stagnant air, and high humidity → perfect for powdery mildew.

Rescue Plan

1. Fungicide: Spray wettable sulfur or neem oil (both sides) weekly until clean.
2. Grow lights: 12–14 hrs/day, 6–12" above plants. LED full-spectrum.
3. Air movement: Small fan on low, oscillating.
4. Move outdoors ASAP: When nights >40°F, acclimate (shade → part sun → full sun over 1 week).
5. Winter protection: In cold zones, heap mulch 12" over crown, wrap canes in burlap. Better than indoors.

Realistic Expectations

Mini roses are outdoor plants. Indoor culture is a holding pattern. Prioritize getting them outside.

If you must overwinter indoors: cool (40–50°F), bright, dry, no fertilizer. They'll drop leaves but survive.