How to Prune Cosmos atrosanguineus Eclipse ('Hamcoec')?
Deadhead to prolong flowering

Cosmos atrosanguineus Eclipse ('Hamcoec') · Cosmos atrosanguineus Eclipse ('Hamcoec')
Grow in moderately fertile, moist but well-drained soil in full sun. Mulch in autumn; in cold areas lift tubers before first frosts and keep frost-free over winter
Deadhead to prolong flowering