Water spots and rosette rot
Pale rings from cold water, mineral marks, or rot where water sits in a rosette.
What you'll see
- Pale yellow or white rings and blotches on fuzzy leaves, such as African violets, where cold water touched.
- Small tan or white papery spots where droplets sat in strong sun.
- Whitish mineral marks after misting with hard water; they wipe off and don't spread.
- A soft, brown, smelly center when water sits in the middle of a rosette plant.
Why it happens
Cold water shocks leaf cells, droplets can focus strong sun, and water trapped in a rosette lets rot start at the growing point.
How to fix it
- Water the soil, not the leaves, or stand the pot in water for about 30 minutes, then let it drain.
- Use room-temperature water, and blot away water left on leaves or in the center.
- Wipe mineral marks off with a soft, damp cloth.
- If the center has rotted, cut out the soft tissue, let it dry, and repot in fast-draining mix.
Keep it from coming back
- Water early in the day so leaves dry before strong sun.
- Don't mist fuzzy-leaved plants.
- Tilt rosette plants a little when watering so no water pools in the center.
Read more
- Bottom watering: how and when
- Watering houseplants in winter
- Tap, rain or filtered water?
- How to clean plant leaves
Sources
- Kindwise plant.health library: Watering on the leaves
- Kindwise plant.health library: Inappropriate leaf rosette watering
- RHS: How to grow African violets
General guidance, not a diagnosis. For valuable, edible or outdoor crops, check with a local extension service or plant expert. Use any product exactly as its label says, and keep children and pets away while it dries.