What's eating my coral bells 'palace purple'?

Coral Bells 'Palace Purple' is most seriously threatened by vine weevil, whose grubs consume the shallow fibrous roots and crown. Foliar nematodes leave dark angular patches on leaves in wet conditions. Slugs attack new growth. Aphids occasionally colonise soft foliage. Vine weevil is by far the most damaging pest of all Heuchera.

Grubs destroy the crown and roots, causing the plant to lift out of the soil or collapse; adults notch leaf edges Apply Steinernema kraussei nematodes in spring and early autumn; use grit-based compost in pots to deter adults

Dark brown triangular or angular patches on leaves, bounded by leaf veins; spreads in wet weather via water splash Remove and bin affected leaves; water at the base, not overhead; improve air circulation

Holes in new leaves especially in spring and after division Grit mulch around the crown; iron phosphate pellets; handpick at night

Small colonies on fresh growth; less common than in many ornamentals Insecticidal soap spray; strong water jet; usually controlled naturally by predators