Dianella prunina prefers consistently moist soil but can tolerate short periods of dryness once established. Water thoroughly when the top 2-3 cm of soil feels dry. Reduce watering during winter dormancy.

Avoid waterlogging, which can lead to root rot.

Prune Dianella prunina primarily to remove dead, damaged, or diseased foliage. Cut back old flower stalks after blooming to maintain a tidy appearance.

In late winter or early spring, you can cut back the entire plant by about one-third to encourage fresh growth.

Dianella prunina is best propagated by division in spring. Carefully dig up the plant and divide the rhizomes into sections, ensuring each section has roots and at least one shoot.

Replant divisions immediately into well-draining soil.

Repot Dianella prunina every 2-3 years, or when the plant becomes root-bound. Choose a pot only slightly larger than the current one. Repot in spring before new growth begins. Use a well-draining potting mix.