How to Grow Hart's Tongue Fern
Asplenium scolopendrium
Hart's tongue fern is one of the easiest shade-garden ferns, producing bold, glossy, undivided strap-like fronds that stay semi-evergreen through mild winters. It thrives in cool, moist, humus-rich soil and deep shade, making it ideal under trees, along north-facing walls, or in damp corners where little else will grow. Plant in autumn or spring, mulch with leaf mould, and water in dry spells until established. It is fully hardy, largely pest-free, and safe for cats and dogs.
Yearly Lifecycle
Care Essentials
Apply a slow-release balanced fertiliser in spring. A light liquid feed monthly through summer is sufficient; avoid high-nitrogen feeds that promote weak, floppy fronds.
Watch For
- Scale insects
- Vine weevil larvae
- Slug and snail damage
- Crown rot from waterlogging
- Frond scorch in direct sun
Companions
Hostas, Astilbe, Epimedium, Hellebore, Wild garlic
Pet Safety
Care Requirements
Light
Deep shade to partial shade
Thrives in deep shade under trees or along north-facing walls. Tolerates dappled light but scorches in direct afternoon sun. One of the few ferns that also does well at the base of a shaded stone wall.
Watering
Keep soil consistently moist, especially in summer
Water regularly during dry spells, particularly in the first season after planting. Once established it is relatively drought-tolerant in shade but benefits from supplemental watering in prolonged dry periods.
Fertilizing
Light annual feed in spring
Apply a slow-release balanced fertiliser in spring or top-dress with leaf mould. Avoid high-nitrogen feeds that produce soft, floppy fronds. Feeding is optional once established in enriched soil.
Pruning
Remove old fronds in late winter
Cut back brown, damaged, or tattered fronds to the base in late winter before new croziers emerge. No other pruning is required. Do not cut back all fronds as the plant is semi-evergreen.
Spacing
40 cm apart
Space plants 30-45 cm apart. The fern forms a slowly expanding clump and will eventually fill its allotted space without becoming invasive.
Growing Tips
Plant in shade, not deep sun
Hart's tongue fern scorches badly in direct sun. A north-facing wall, dense tree canopy, or shaded border is ideal. Morning light filtered through trees is acceptable.
Moist, humus-rich soil is essential
Incorporate leaf mould or garden compost when planting. The fern prefers slightly alkaline to neutral soil and will thrive in the cool, moist conditions at the base of a limestone wall.
Tidy old fronds before new ones emerge
Remove brown or battered fronds in late winter to make way for the flush of new growth in spring. New fronds unfurl in a tight crozier shape.
Mulch annually with leaf mould
An annual mulch with leaf mould or compost keeps roots cool and moist, suppresses weeds, and mimics the natural woodland-floor conditions the fern prefers.
