Keep the soil consistently moist but not waterlogged. Water thoroughly when the top 2-3 cm of soil feels dry. Reduce watering slightly in cooler months, but avoid letting the plant dry out completely.

Good drainage is crucial to prevent root rot.

Prune lightly after flowering to encourage bushier growth and to remove any spent or dead flower stalks. Trim back leggy stems to maintain a compact shape.

Pruning helps direct energy towards new growth and can improve overall plant health and appearance.

Propagate Spigelia anthelmia from seed or by division. Sow seeds in spring in a well-draining seed-starting mix. Divisions can be made in early spring when new growth appears.

Ensure divisions have healthy roots and at least one stem before replanting.

Repot young plants annually or every two years in early spring before new growth begins. Mature plants may only need repotting every 3-4 years.

Choose a pot one size larger than the current one with fresh, well-draining potting mix. Ensure the new pot has drainage holes.