Troubleshooting
Long-Petalled Lewisia problems — and how to fix them
Long-Petalled Lewisia (Lewisia longipetala) 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.
Crown and taproot rot
Summer rain or over-irrigation reaching the dormant crown is virtually always fatal. This species is more demanding than L. cotyledon; in wet-summer climates it should be grown exclusively in an alpine house where moisture can be strictly controlled.
Heat stress and premature dormancy
High summer temperatures (above 25°C) cause earlier than normal dormancy and a weak re-emergence in autumn. Provide afternoon shade, ventilate freely, and mulch the pot surface with reflective grit to keep the root zone cool.
Prevent long-petalled lewisia problems before they start
Most long-petalled lewisia issues are care-mismatch, not bad luck. Dial in the basics:
Long-Petalled Lewisia problems — FAQ
Why is my long-petalled lewisia crown and taproot rot?
Summer rain or over-irrigation reaching the dormant crown is virtually always fatal. This species is more demanding than L. cotyledon; in wet-summer climates it should be grown exclusively in an alpine house where moisture can be strictly controlled.
Why is my long-petalled lewisia heat stress and premature dormancy?
High summer temperatures (above 25°C) cause earlier than normal dormancy and a weak re-emergence in autumn. Provide afternoon shade, ventilate freely, and mulch the pot surface with reflective grit to keep the root zone cool.