Korean rock fern

For watering Korean rock fern it is important to check the soil on a regular basis and water only when the top inch of the soil is dry. When the soil is dry enough, it should be watered thoroughly until water begins to drain from the bottom of the pot. Allow the soil to dry out completely between watering to allow air to enter the soil and promote healthy root growth. Too frequent watering can result in root rot and nutrient deficiencies. In the summer, you may need to water the Korean rock fern more often than in the winter.

Korean rock fern (Polystichum luctuosum (syn. P. tsus-simense)) prefers bright, indirect light. To achieve this, place a potted Korean rock fern in an east- or west-facing window. If the light is too intense, filter it with sheer curtains or a window film. During summer months, some outdoor shade is beneficial. Avoid placing a Korean rock fern directly in a strong, direct sunlight. While a few hours of morning sunlight or late afternoon sun are beneficial, it is best to keep a Korean rock fern out of direct sunlight during peak light hours or it may suffer from scorched fronds.

Korean rock fern should be pruned in early spring or late summer. Pruning should focus on removing dead or diseased fronds and removing any encroaching stems that are crowding the main fern crown. In order to maintain the desired shape of the fern, older fronds should be cut off just above the rhizome. If the fern becomes large or overgrown, it may be necessary to divide the plant into multiple clumps. It is important to remember that pruning should only be done as much as is necessary and appropriate for the particular fern.