Agrostis agrostiflora prefers consistently moist soil, especially during its active growth period. Water thoroughly when the top 2-3 cm of soil feels dry. Avoid waterlogged conditions, which can lead to root rot.

Reduce watering in cooler months when growth slows.

Prune Agrostis agrostiflora back hard in late winter or early spring before new growth begins. This removes dead foliage and encourages vigorous new shoots.

For ornamental purposes, spent flower stalks can be trimmed after blooming to maintain a tidy appearance.

Agrostis agrostiflora is best propagated by division in spring or early autumn. Carefully dig up the plant and separate the root ball into smaller sections, ensuring each section has healthy roots and shoots.

Replant the divisions immediately into well-prepared soil.

Repotting is generally not necessary for Agrostis agrostiflora, as it is a perennial grass often grown in borders or containers.

If grown in a container, repot every 2-3 years in spring to refresh the soil and accommodate root growth. Use a well-draining potting mix.