Water regularly, especially during dry spells, to keep the soil consistently moist but not waterlogged. Deep watering encourages stronger root development. Reduce watering in late fall as the plant enters dormancy.

Avoid overhead watering to minimize the risk of fungal diseases on foliage.

Deadhead spent flower scapes promptly to encourage more blooms and prevent seed formation, which can drain energy. Cut back faded foliage to the ground in late fall or early spring before new growth begins.

This improves plant appearance and reduces disease overwintering.

Divide mature clumps in early spring or fall every 3-5 years to rejuvenate the plant and prevent overcrowding. Replant divisions immediately, ensuring the crown is just at or slightly above soil level.

Water thoroughly after planting to help them establish.

Repotting is typically not necessary for Hemerocallis hakuunensis as they are often planted directly in the ground.

If grown in containers, repot every 3-4 years in spring or fall to refresh the soil and divide overcrowded root balls. Use well-draining potting mix.