Pentanema salicinum prefers consistently moist soil but can tolerate brief dry spells. Water thoroughly when the top 2-3 cm of soil feels dry. Avoid waterlogging, especially in winter.

Reduce watering frequency during dormancy, allowing the soil to dry out slightly between waterings.

Prune back spent flower stalks after blooming to encourage a tidier appearance and potentially a second bloom. In late winter or early spring, remove any dead or damaged foliage.

Cut back the entire plant to about 5-10 cm above ground level to promote vigorous new growth.

Pentanema salicinum can be propagated by division of established clumps in spring. Carefully separate the root ball into smaller sections, ensuring each section has roots and shoots.

Replant divisions immediately into well-prepared soil. It can also be grown from seed sown in autumn or spring.

Repotting is generally only necessary when the plant becomes root-bound or needs to be divided. This is best done in spring before new growth begins.

Choose a pot that is only slightly larger than the current one and use a well-draining potting mix. Ensure good contact between the roots and the soil.