Galium sylvaticum prefers consistently moist soil. Water regularly, especially during dry spells, to prevent the soil from drying out completely. Reduce watering in winter when the plant is dormant.

Ensure good drainage to avoid waterlogged conditions, which can lead to root rot.

Prune Galium sylvaticum after flowering to maintain a tidy appearance and encourage denser growth. Remove dead or faded flower stems.

Light trimming can also be done in early spring to shape the plant and remove any winter damage. Avoid heavy pruning.

Propagation is typically done by division of established clumps in early spring or autumn. Carefully separate the root ball into smaller sections, ensuring each has roots and shoots.

Replant immediately into well-drained soil. Seeds can also be sown in autumn or after cold stratification.

Repot Galium sylvaticum when it becomes pot-bound, usually every 2-3 years. This is best done in early spring before new growth begins. Use a slightly larger pot with fresh, well-draining potting mix.

Ensure the plant is watered thoroughly after repotting.