Troubleshooting
Darwin's Slipper problems — and how to fix them
Darwin's Slipper (Calceolaria uniflora) 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.
Failure to thrive in warm summers
This strictly alpine species deteriorates and dies when summer temperatures exceed 20–22 °C (68–72 °F) for extended periods; it is best grown in an unheated alpine house or a cool, well-ventilated north-facing trough.
Crown and root rot
The crown is highly susceptible to wet-rot, especially during winter or in periods of cold, wet weather; top-dress around the collar with coarse grit to keep moisture away from the crown and ensure immediate drainage.
Prevent darwin's slipper problems before they start
Most darwin's slipper issues are care-mismatch, not bad luck. Dial in the basics:
Darwin's Slipper problems — FAQ
Why is my darwin's slipper failure to thrive in warm summers?
This strictly alpine species deteriorates and dies when summer temperatures exceed 20–22 °C (68–72 °F) for extended periods; it is best grown in an unheated alpine house or a cool, well-ventilated north-facing trough.
Why is my darwin's slipper crown and root rot?
The crown is highly susceptible to wet-rot, especially during winter or in periods of cold, wet weather; top-dress around the collar with coarse grit to keep moisture away from the crown and ensure immediate drainage.