Galium palustre thrives in consistently moist to wet soil. Water regularly, ensuring the substrate never dries out completely.

In container culture, maintain a water reservoir or place the pot in a saucer filled with water to mimic boggy conditions. Overwatering is generally not an issue as long as drainage is adequate to prevent stagnation.

Pruning is generally minimal. Pinch back leggy stems in late spring or early summer to encourage bushier growth and a more compact form.

Remove any dead or yellowing foliage as needed to maintain plant health and appearance. Late autumn pruning can tidy the plant for winter.

Propagation is easily achieved through division of established clumps in spring. You can also sow fresh seeds collected in autumn directly into moist soil or pots.

Stem cuttings taken in spring or early summer will root readily in moist substrate.

Repot Galium palustre in spring as needed, typically every 1-2 years, especially when grown in containers. Choose a pot that is slightly larger than the current one.

Use a well-draining, moisture-retentive potting mix, ideally amended with compost or peat to retain humidity.