Astilbe Spacing Guide: Proper Plant Distance & Grouping
Your astilbe plants reach 18 to 30 inches wide at maturity while your neighbor’s identical variety spreads into dense sweeps covering twice the ground. The difference comes from spacing plants 18 to 24 inches apart instead of cramming them together[1][2]. This distance allows roots to establish without competition and creates the lush display astilbe is known for….
