Troubleshooting
Tormentil problems — and how to fix them
Tormentil (Potentilla erecta) 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.
Failure to thrive on alkaline or clay soils
Tormentil is a strict calcifuge; yellowing, poor growth, or death usually indicate the soil pH is too high. Test soil and amend with sulphur, ericaceous compost, or peat if necessary.
Powdery mildew in dry periods
In dry, warm summers the foliage may develop powdery mildew, especially in sheltered spots with poor air circulation. Improve ventilation and avoid wetting the foliage when watering.
Prevent tormentil problems before they start
Most tormentil issues are care-mismatch, not bad luck. Dial in the basics:
Tormentil problems — FAQ
Why is my tormentil failure to thrive on alkaline or clay soils?
Tormentil is a strict calcifuge; yellowing, poor growth, or death usually indicate the soil pH is too high. Test soil and amend with sulphur, ericaceous compost, or peat if necessary.
Why is my tormentil powdery mildew in dry periods?
In dry, warm summers the foliage may develop powdery mildew, especially in sheltered spots with poor air circulation. Improve ventilation and avoid wetting the foliage when watering.