Troubleshooting
Sempervivum montanum problems — and how to fix them
Sempervivum montanum (Sempervivum montanum) 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.
Winter wet rot
Cold combined with damp soil rots the crown and roots. Keep almost completely dry through winter, use a free-draining gritty mix, and shelter from prolonged rain if grown outdoors.
Etiolation in low light
Too little sun makes the compact rosettes stretch and pale. This species needs full sun; relocate to the brightest position or add supplementary lighting to keep the cushion tight.
Heat and humidity stress
An alpine, it dislikes hot, muggy summers. Provide airflow and afternoon relief in extreme heat; stagnant humid warmth invites fungal rot in the dense rosettes.
Mealybugs and vine weevil
Mealybugs nest in tight rosette centres and weevil larvae attack roots. Check the crown regularly, spot-treat with diluted alcohol, and repot if grubs are found in the rootball.
Prevent sempervivum montanum problems before they start
Most sempervivum montanum issues are care-mismatch, not bad luck. Dial in the basics:
Looking for sempervivum montanum in general rather than its problems? Read the full sempervivum montanum care guide — light, water, soil and feeding.
Sempervivum montanum problems — FAQ
Why is my sempervivum montanum winter wet rot?
Cold combined with damp soil rots the crown and roots. Keep almost completely dry through winter, use a free-draining gritty mix, and shelter from prolonged rain if grown outdoors.
Why is my sempervivum montanum etiolation in low light?
Too little sun makes the compact rosettes stretch and pale. This species needs full sun; relocate to the brightest position or add supplementary lighting to keep the cushion tight.
Why is my sempervivum montanum heat and humidity stress?
An alpine, it dislikes hot, muggy summers. Provide airflow and afternoon relief in extreme heat; stagnant humid warmth invites fungal rot in the dense rosettes.
Why is my sempervivum montanum mealybugs and vine weevil?
Mealybugs nest in tight rosette centres and weevil larvae attack roots. Check the crown regularly, spot-treat with diluted alcohol, and repot if grubs are found in the rootball.