Eremurus altaicus prefers moderate watering during its active growth period in spring. Allow the soil to dry out slightly between waterings.

Reduce watering significantly once the foliage begins to yellow and die back in summer, and keep it dry during winter dormancy to prevent root rot.

Remove spent flower stalks after blooming to prevent seed formation, which can drain the plant's energy. Cut back the dead foliage to the ground in late autumn or early winter once it has fully withered.

This helps maintain a tidy appearance and prevents disease.

Propagate Eremurus altaicus by division of its fleshy roots in early spring before new growth begins, or in late summer/early autumn after the foliage has died back. Carefully separate the rhizomes, ensuring each division has at least one viable bud, and replant immediately.

Repotting is generally not required annually, as these are long-lived perennials. If necessary, repot Eremurus altaicus every 3-5 years in early spring or late summer when the plant is dormant.

Ensure the new pot provides ample space for the substantial root system and excellent drainage.