Aruncus is a hardy, clump-forming perennial that prefers moist, humus-rich soil and a partially shaded to sunny position, though it will tolerate full sun if the soil stays reliably damp.
When planting, enrich the soil with compost or well-rotted manure and water in well. Keep the soil moist, especially in dry spells, as it dislikes drying out.
Deadhead faded flower spikes if you want to tidy the plant, or leave them for autumn structure. In autumn, cut back flowered stems to near ground level and apply a thick mulch around the base to protect the crown and feed the plant for the following season.
Divide overcrowded clumps every few years in early spring or autumn to maintain vigour.