Troubleshooting
Hairy Alpine Primrose problems — and how to fix them
Hairy Alpine Primrose (Primula hirsuta) is generally forgiving once you match its basics, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Crown and root rot
Primula hirsuta is acutely sensitive to waterlogging. Heavy soil or overhead watering causes Botrytis and Phytophthora rot. Always use gritty, acidic compost, pot in terracotta, and water at the base only. Remove any mushy tissue immediately and dust with sulphur powder.
Botrytis (grey mould)
The hairy leaves trap moisture and debris, providing ideal conditions for Botrytis cinerea in still air. Improve air circulation, remove dead leaves promptly, and avoid overcrowding. A preventative copper-based fungicide spray in autumn is beneficial in high-humidity climates.
Lime-induced chlorosis
Being an obligate calcifuge (lime-hater), P. hirsuta quickly shows yellowing interveinal chlorosis if watered with hard tap water or planted in alkaline soil. Use rainwater or acidified water, and an ericaceous compost — never add lime or garden soil.
Prevent hairy alpine primrose problems before they start
Most hairy alpine primrose issues are care-mismatch, not bad luck. Dial in the basics:
Hairy Alpine Primrose problems — FAQ
Why is my hairy alpine primrose crown and root rot?
Primula hirsuta is acutely sensitive to waterlogging. Heavy soil or overhead watering causes Botrytis and Phytophthora rot. Always use gritty, acidic compost, pot in terracotta, and water at the base only. Remove any mushy tissue immediately and dust with sulphur powder.
Why is my hairy alpine primrose botrytis (grey mould)?
The hairy leaves trap moisture and debris, providing ideal conditions for Botrytis cinerea in still air. Improve air circulation, remove dead leaves promptly, and avoid overcrowding. A preventative copper-based fungicide spray in autumn is beneficial in high-humidity climates.
Why is my hairy alpine primrose lime-induced chlorosis?
Being an obligate calcifuge (lime-hater), P. hirsuta quickly shows yellowing interveinal chlorosis if watered with hard tap water or planted in alkaline soil. Use rainwater or acidified water, and an ericaceous compost — never add lime or garden soil.