How to Prune heucherella 'Stoplight'?
Remove dead leaves and deadhead

heucherella 'Stoplight' · ×Heucherella 'Stoplight'
Grow in fertile, moist, but well-drained soil in sun or partial shade. If the soil is moist, a sunnier position may be tolerated. To prevent the rhizomes rising to the surface, mulch annually and divide every few years
Remove dead leaves and deadhead