Maintain consistently moist soil for Viola palustris. It thrives in waterlogged or boggy conditions and should never be allowed to dry out completely.

Water frequently, especially during warmer months, to mimic its natural wetland habitat. Reduce watering slightly in winter but keep the soil damp.

Pruning is generally not required for Viola palustris, as it forms a low-growing clump. However, you can remove any dead or damaged foliage to maintain tidiness.

Deadheading spent flowers can encourage more blooms and prevent the plant from expending energy on seed production.

Viola palustris can be easily propagated by division of established clumps in spring or autumn. Seeds can also be sown fresh in autumn or stratified and sown in spring.

Runners, if present, can be detached and planted out.

Repotting is rarely necessary for Marsh Violets, as they are typically grown in garden beds or containers that mimic their natural wetland environment. If grown in a pot, repot only when the plant becomes pot-bound, usually every 2-3 years, in spring using a moist, humus-rich soil mix.