Asplenium fontanum: complete guide

Overview

Asplenium fontanum, commonly known as fountain spleenwort or smooth rock-spleenwort, is an elegant fine-leaved fern from the Aspleniaceae family. This European mountain species prefers shaded rocky locations and is ideal for alpine gardens, rock walls, and woodland corners with moisture.

Appearance & bloom

Fountain spleenwort forms dense rosettes of finely divided, hairlike fronds in bright green color. Plants reach 10-20 cm height and form tight clusters. The delicate, undulating foliage gives the plant an exceptionally elegant appearance. Ferns have no flowers but produce spores.

Ideal location

Choose half-shaded to deeply shaded locations with sheltered exposure. This fern thrives on moist, well-drained sites like rock walls, between stones, and mountainous terrain. Avoid hot, sunny spots.

Soil

Asplenium fontanum prefers well-drained, humus-rich soil. Add sawdust, leaf mold, and gravel for optimal drainage. pH tolerance is broad, from acidic to neutral, pH 5.5-7.5. Lean nutrients acceptable.

Watering

Moisture requirement high; water regularly for optimal growth. Prefers moisture without waterlogging. The plant tolerates regular moisture well. Preference for moisture misting.

Pruning

Minimal pruning needed. Remove only dead fronds. The plant self-manages leaf drop and natural shaping.

Maintenance calendar

February-March: prepare for growth. April-May: new fronds unfurl. June-September: peak growth. October-January: slow growth.

Winter hardiness

Asplenium fontanum is fully hardy to -15 degrees Celsius. Thrives even in very cold mountain regions.

Companion plants

Pair with other shade-loving ferns: Polystichum, Dryopteris, other Asplenium species. Also lovely with shade-tolerant plants like Helleborus and Epimedium.

Closing

Fountain spleenwort is essential for shaded alpine and woodland gardens. With minimal care, this elegant fern provides year-round fine foliage structure. Visit gardenworld.app/en and gardenworld.app/nl.