Water Viola mandshurica regularly, keeping the soil consistently moist but not waterlogged. Allow the top inch of soil to dry out slightly between waterings, especially during warmer months.

Reduce watering in winter when the plant's growth slows down.

Prune Viola mandshurica after flowering to encourage a tidier appearance and potentially a second bloom. Deadhead spent flowers regularly to prevent seed formation and promote more blossoms.

Trim back any leggy or overgrown stems.

Viola mandshurica can be propagated by seed sown in autumn or spring. Alternatively, division of established clumps in spring or autumn is an effective method.

Softwood cuttings can also be taken in late spring or early summer.

Repot young Viola mandshurica plants annually or biennially in spring. Established plants may only need repotting every 2-3 years.

Use a well-draining potting mix and choose a pot only slightly larger than the current one.