Troubleshooting
Large-Flowered Houseleek problems — and how to fix them
Large-Flowered Houseleek (Sempervivum grandiflorum) 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.
Monocarpic rosette die-back after flowering
The central flowering rosette dies naturally after setting seed — this is normal biology, not disease. Remove the dead rosette and allow the surrounding offsets to fill the gap; there is no remedy as it is a genetically programmed event.
Root and crown rot in waterlogged soil
Persistently wet soil, especially in winter, causes Phytophthora and Pythium root rots. Always plant in free-draining grit-based compost; raise beds or use troughs and apply a layer of grit as a surface mulch around the rosette neck.
Prevent large-flowered houseleek problems before they start
Most large-flowered houseleek issues are care-mismatch, not bad luck. Dial in the basics:
Large-Flowered Houseleek problems — FAQ
Why is my large-flowered houseleek monocarpic rosette die-back after flowering?
The central flowering rosette dies naturally after setting seed — this is normal biology, not disease. Remove the dead rosette and allow the surrounding offsets to fill the gap; there is no remedy as it is a genetically programmed event.
Why is my large-flowered houseleek root and crown rot in waterlogged soil?
Persistently wet soil, especially in winter, causes Phytophthora and Pythium root rots. Always plant in free-draining grit-based compost; raise beds or use troughs and apply a layer of grit as a surface mulch around the rosette neck.