Petasites formosanus prefers consistently moist soil. Water regularly, especially during warmer months and dry spells, to prevent the rhizomes from drying out.

Aim to keep the soil damp but not waterlogged, as this can lead to root rot. Reduce watering slightly in cooler, dormant periods.

Pruning is primarily for aesthetic purposes and to control spread. Cut back dead or damaged foliage as needed.

If the plant becomes too vigorous, rhizome division (a form of pruning) can be done in early spring or autumn to manage its size and encourage new growth.

Petasites formosanus is easily propagated by division of its rhizomes. In early spring or autumn, carefully dig up sections of the rhizome that contain at least one growth bud.

Replant these sections immediately into well-draining soil in a similar location.

Repotting is usually only necessary if the plant is severely pot-bound or if propagation by division is intended. This is best done in early spring before new growth emerges or in early autumn.

Ensure the new pot is only slightly larger and filled with fresh, moist, well-draining potting mix.