Problem
Why is my red bistort 'Firetail' dropping leaves?
Persicaria amplexicaulis 'Firetail'
Leaf drop on a red bistort 'Firetail' usually has one of three causes — watering, light or a pest. Walk through them in order before reaching for a treatment.
Most likely causes
Detailed cause-by-cause guide is being prepared. In the meantime: check watering rhythm, sunlight match, and any visible pests on the underside of leaves.