Persicaria filiformis prefers consistently moist soil. Water regularly, especially during dry periods, ensuring the soil does not completely dry out. Reduce watering in cooler months, but maintain some moisture.

Avoid waterlogging, which can lead to root rot.

Prune in late winter or early spring before new growth begins. Cut back old stems to about 10-15 cm from the ground to encourage fresh, healthy foliage and flowering. Remove any dead or damaged stems at any time.

Persicaria filiformis is easily propagated by division in spring. Carefully dig up the plant and separate clumps, ensuring each division has roots and shoots. Replant divisions immediately into well-prepared soil.

Stem cuttings can also be taken in summer.

Repot container-grown plants every 2-3 years, or when they become root-bound. Spring is the ideal time. Choose a pot that is only slightly larger than the current one. Use a good quality, well-draining potting mix.