Troubleshooting
Sempervivum 'Killer' problems — and how to fix them
Sempervivum 'Killer' (Sempervivum 'Killer') 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.
Loss of red colour
The scarlet flush depends on full sun, cool temperatures, and lean conditions. In heat, shade, or with feeding the rosettes green over; raise light, reduce fertiliser, and expect summer warmth to soften the colour.
Overwatering and rot
Soggy soil rots the crown and roots, the main cause of death. Plant in gritty mix, water only when fully dry, and keep nearly dry in winter.
Etiolation
Too little light stretches and pales the rosettes. Relocate to the brightest position or add a grow light to keep the form compact and vivid.
Mealybugs and vine weevil
Mealybugs hide between leaves and weevil larvae feed on roots. Check the crown and rootball, treat with diluted alcohol or a suitable systemic, and ensure good airflow.
Prevent sempervivum 'killer' problems before they start
Most sempervivum 'killer' issues are care-mismatch, not bad luck. Dial in the basics:
Looking for sempervivum 'killer' in general rather than its problems? Read the full sempervivum 'killer' care guide — light, water, soil and feeding.
Sempervivum 'Killer' problems — FAQ
Why is my sempervivum 'killer' loss of red colour?
The scarlet flush depends on full sun, cool temperatures, and lean conditions. In heat, shade, or with feeding the rosettes green over; raise light, reduce fertiliser, and expect summer warmth to soften the colour.
Why is my sempervivum 'killer' overwatering and rot?
Soggy soil rots the crown and roots, the main cause of death. Plant in gritty mix, water only when fully dry, and keep nearly dry in winter.
Why is my sempervivum 'killer' etiolation?
Too little light stretches and pales the rosettes. Relocate to the brightest position or add a grow light to keep the form compact and vivid.
Why is my sempervivum 'killer' mealybugs and vine weevil?
Mealybugs hide between leaves and weevil larvae feed on roots. Check the crown and rootball, treat with diluted alcohol or a suitable systemic, and ensure good airflow.