Diplazium assimile prefers consistently moist soil. Water thoroughly when the top 2-3 cm of soil begins to feel dry. Avoid letting the pot stand in water, as this can lead to root rot.

Reduce watering slightly during cooler months but do not allow the soil to dry out completely.

Prune Diplazium assimile primarily to remove dead, damaged, or discolored fronds. Use clean, sharp scissors or pruning shears to make cuts close to the base of the plant.

This encourages healthy new growth and maintains the plant's tidy appearance. Pruning can be done at any time of year as needed.

Diplazium assimile can be propagated by division of rhizomes. Carefully divide mature plants in spring, ensuring each section has healthy roots and fronds. Replant divisions into well-draining potting mix.

Alternatively, spores can be collected and sown on moist, sterile medium, though this is a slower method.

Repot Diplazium assimile every 2-3 years, or when it becomes root-bound. Use a well-draining, peat-based potting mix. Choose a pot that is only slightly larger than the current one.

Repotting is best done in spring before the start of active growth to minimize transplant shock.