Troubleshooting
Toothed Sage problems — and how to fix them
Toothed Sage (Salvia runcinata) 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.
Poor winter survival in cold or wet climates
Borderline hardy in USDA zone 7 and below frost tolerance in the UK (RHS H3); in colder regions it may die back to the rootstock in severe winters. Mulch the crown well before the first hard frost and shelter from cold, drying winds; grow against a warm wall in marginal areas.
Spider mites in hot, dry indoor conditions
If overwintered under glass or grown as a container plant indoors, hot and dry conditions favour spider mite infestations, which cause fine stippling and bronzing of leaves. Raise humidity around the plant, mist foliage regularly, and treat with insecticidal soap or neem oil at the first sign of infestation.
Prevent toothed sage problems before they start
Most toothed sage issues are care-mismatch, not bad luck. Dial in the basics:
Toothed Sage problems — FAQ
Why is my toothed sage poor winter survival in cold or wet climates?
Borderline hardy in USDA zone 7 and below frost tolerance in the UK (RHS H3); in colder regions it may die back to the rootstock in severe winters. Mulch the crown well before the first hard frost and shelter from cold, drying winds; grow against a warm wall in marginal areas.
Why is my toothed sage spider mites in hot, dry indoor conditions?
If overwintered under glass or grown as a container plant indoors, hot and dry conditions favour spider mite infestations, which cause fine stippling and bronzing of leaves. Raise humidity around the plant, mist foliage regularly, and treat with insecticidal soap or neem oil at the first sign of infestation.