It may be vine weevil, however they usually chew away at the edges of leaves leaving a semi-circular 'bite' mark. They are particularly fond on Heuchera so it may be worth while gently tipping your plant out of it's pot to examine the roots. The grubs are easily identified, they are white with a brown head and if present will devour roots causing the plant to collapse. If you find any I would recommend you wash off all the affected compost from the plant and dispose of it (not on the garden or compost bin). Then replant in fresh compost. Good luck |
Mix a bit of food grade diatomaceous earth in the soil and a bit on top. |