Troubleshooting
Siskiyou Lewisia problems — and how to fix them
Siskiyou Lewisia (Lewisia cotyledon) 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 neck rot
The most common cause of death; wet conditions at the crown — especially in winter — cause rapid fungal rot. Prevent by planting at an angle, using a grit collar, and ensuring overhead protection in wet climates.
Aphids
Greenfly congregate in the leaf axils of the rosette, particularly under glass. Check regularly and treat with insecticidal soap or neem oil; avoid disturbing the brittle leaves.
Slugs and snails
Rasping damage to fleshy leaves is common outdoors in wet weather. Use copper tape around containers, apply wildlife-safe slug pellets, or topdress with sharp grit as a physical deterrent.
Prevent siskiyou lewisia problems before they start
Most siskiyou lewisia issues are care-mismatch, not bad luck. Dial in the basics:
Siskiyou Lewisia problems — FAQ
Why is my siskiyou lewisia crown and neck rot?
The most common cause of death; wet conditions at the crown — especially in winter — cause rapid fungal rot. Prevent by planting at an angle, using a grit collar, and ensuring overhead protection in wet climates.
Why is my siskiyou lewisia aphids?
Greenfly congregate in the leaf axils of the rosette, particularly under glass. Check regularly and treat with insecticidal soap or neem oil; avoid disturbing the brittle leaves.
Why is my siskiyou lewisia slugs and snails?
Rasping damage to fleshy leaves is common outdoors in wet weather. Use copper tape around containers, apply wildlife-safe slug pellets, or topdress with sharp grit as a physical deterrent.