Hart's Tongue Fern

Hart’s Tongue Fern, or Asplenium scolopendrium, is a distinctive evergreen fern known for its smooth, glossy, tongue-like fronds that remain attractive throughout the year. It is ideal for shaded borders, woodland gardens, walls, and containers, adding bold texture and year-round structure. The Royal Horticultural Society has given it its prestigious Award of Garden Merit (AGM).

Providing seasonal care is essential to maintain healthy fronds and long-term performance. Below is a complete seasonal care guide for Hart’s Tongue Fern throughout the year.

Spring

Pruning and Maintenance

In early spring, remove any damaged, browned, or winter-worn fronds using clean, sharp secateurs. This allows fresh new fronds to emerge and keeps the plant looking neat.

Feed

Apply a mulch of well-rotted compost  in spring to enrich the soil and support healthy new growth. Avoid strong fertilisers, as ferns prefer gentle feeding.

Dividing (if necessary)

Every 4–5 years, Hart’s Tongue Fern can be divided in spring if clumps become overcrowded. Lift carefully, divide the crown into sections, and replant into moist, well-drained, humus-rich soil.

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Begin regular watering as temperatures rise, keeping the soil evenly moist during establishment.

Summer

Pruning and Maintenance

Minimal pruning is required in summer. Remove any damaged or yellowing fronds to maintain appearance and improve airflow around the plant.

Mulching

Apply a 2 to 3-inch layer of organic mulch around the base of the plant to retain moisture, suppress weeds, and keep roots cool.

Watering

Hart’s Tongue Fern prefers consistently moist soil. Water during dry spells, particularly in warm weather, and avoid allowing the soil to dry out completely.

Autumn

Pruning and Maintenance

Remove any tired or damaged fronds as needed, but avoid heavy pruning. The evergreen foliage provides structure and interest through autumn and winter.

Protection from frost

Refresh the mulch around the base of the plant to protect roots and improve soil condition as temperatures begin to fall.

Winter

Pruning and Maintenance

Little pruning is required during winter. Remove only clearly dead or damaged fronds, taking care not to disturb healthy growth.

Protection from frost

Hart’s Tongue Fern is fully hardy, but a light mulch helps protect the crown from severe frost and winter wet, particularly in exposed or container-grown plants.

Pest and disease prevention

Pests and diseases are uncommon in winter, but inspect occasionally for slug damage or signs of rot caused by excessive moisture and remove any affected growth promptly.

Plant SOS

Browning fronds – A sign of dry soil or sun exposure. Increase watering and move to a shadier position.

Yellowing fronds – A sign of waterlogged soil. Improve drainage and reduce watering.

Split or distorted fronds – A sign of physical damage or exposure. Provide shelter from wind and foot traffic.

Sparse growth – A sign of poor soil or overcrowding. Improve soil with organic matter or divide mature clumps.

Loss of gloss – A sign of drought stress. Maintain consistent soil moisture and mulch well.

Holes in leaves – A sign of slug and snail damage. Use Slug and Snail repellent or Slug and Snail control.