Troubleshooting
Downy Rock Jasmine problems — and how to fix them
Downy Rock Jasmine (Androsace pubescens) is generally low-drama, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Winter cushion rot
Persistent winter rain or condensation on the rosettes causes Botrytis grey mould and rapid crown decay; overhead glass or polycarbonate protection from late autumn to early spring is the single most effective preventive measure.
Red spider mite (in alpine house conditions)
Dry, warm conditions inside a glass alpine house can encourage red spider mite; increase ventilation and mist surrounding surfaces (not the plant) to raise local humidity, or use a predatory mite such as Phytoseiulus persimilis.
Prevent downy rock jasmine problems before they start
Most downy rock jasmine issues are care-mismatch, not bad luck. Dial in the basics:
Downy Rock Jasmine problems — FAQ
Why is my downy rock jasmine winter cushion rot?
Persistent winter rain or condensation on the rosettes causes Botrytis grey mould and rapid crown decay; overhead glass or polycarbonate protection from late autumn to early spring is the single most effective preventive measure.
Why is my downy rock jasmine red spider mite (in alpine house conditions)?
Dry, warm conditions inside a glass alpine house can encourage red spider mite; increase ventilation and mist surrounding surfaces (not the plant) to raise local humidity, or use a predatory mite such as Phytoseiulus persimilis.