How to Prune astilbe 'Köln'?
Cut back after flowering

astilbe 'Köln' · Astilbe 'Köln'
Grow in moist but well-drained or boggy soil in dappled shade, or in indirect sun where the soil remains moisture-retentive in summer. Drought intolerant, may be damaged in hot sun. Good for waterside planting. See Astilbe cultivation
Cut back after flowering