Sempervivum (Hens & Chicks) Cold Tolerance and Transplant Timing

Jan asked the coldest temperature Sempervivum tolerates and when to transplant.

Answers

Cold tolerance: Most survive -20°F to -30°F (-29°C to -34°C) if acclimated. First-year plants may need protection.
Best transplant time: Spring (after last frost) for Northern Hemisphere natives.

Acclimate gradually if moving from indoors to outdoors.

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