Water Hordeum brevisubulatum regularly, especially during its active growth period. Allow the soil to dry slightly between waterings. Reduce watering significantly during dormancy to prevent root rot.

Ensure good drainage to avoid waterlogged conditions, which this species dislikes.

Pruning is generally not required for Hordeum brevisubulatum unless shaping is desired or dead foliage needs removal. Cut back dried foliage in late winter or early spring before new growth emerges to maintain a tidy appearance and encourage fresh shoots.

Hordeum brevisubulatum is easily propagated by seed or division. Sow seeds in autumn or early spring. Divisions can be made in early spring or autumn, ensuring each section has healthy roots and shoots.

This grass spreads readily.

Repotting is rarely necessary for Hordeum brevisubulatum as it is often grown in the ground or in containers where it can naturalize. If grown in a pot and it becomes overcrowded or root-bound, repot in early spring into a slightly larger container with well-draining soil.