Dealing with Hard Water Deposits and Powdery Mildew on Houseplants

A mister system left calcium buildup on leaves. Wiping with milk helped slightly but leaves kept dying. New growth is appearing.

Milk Makes It Worse

Milk adds sugars and more calcium, promoting fungal growth.

Likely Powdery Mildew

Overhead watering with hard water creates perfect conditions for powdery mildew.

Indoor‑Safe Treatment

Spray entire plant (front and back of leaves) with Lysol (generic OK) held 12–18 inches away. Repeat twice weekly for 4 weeks. This mild fungicide is safe for indoor use.