Moonwort
Botrychium lunaria · Ophioglossaceae
The gardener's calendar
Ideal time to plant moonwort: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.
ID card
- Foliage
- Deciduous, disappears in summer
- Plant type
- Primitive fern from the Ophioglossaceae family
- Adult size
- 10 to 30 cm in height
- Hardiness
- Very hardy (zones 3-9)
- Origin
- Temperate and boreal Northern Hemisphere
- Natural habitat
- Damp meadows, grasslands, shaded areas
- Growth
- Very slow
- Biological cycle
- Geophyte with spring vernal leaves
Care
Watering
Keep the soil moist during spring growth and through early summer. Gradually reduce watering from June-July onwards, as the plant enters natural dormancy. Well-draining soil is essential to prevent rhizome rot during winter.
Light exposure
Prefer a semi-shaded or shaded location, mimicking its natural habitat of damp meadows under partial cover. Avoid direct, scorching afternoon sun, especially in Mediterranean climates.
Soil
Plant the moonwort in soil rich in organic matter, well-draining yet moisture-retentive. Slightly acidic to neutral pH works perfectly. Enrich the soil with compost or peat at planting time.
Pruning and cleanup
No pruning is necessary. After the fronds disappear in late summer, gently clean the area by removing debris. Leave the rhizome in place: it will regrow the following spring.
Fertilizer
Moonwort requires minimal nutritional maintenance. A single application of well-decomposed compost in spring is quite sufficient. Avoid harsh chemical fertilizers that could disrupt its natural ecosystem.
Diseases and pests
This fern is generally very robust. The main risk lies in rhizome rot if stagnant water pools during winter. Ensure impeccable drainage. Pests rarely trouble it.
Did you know?
The moonwort is an ancestral fern with a remarkable biological cycle: its fronds appear only in spring and disappear completely in summer, while the plant survives solely thanks to a tiny underground rhizome. It was once sought after for folk uses across Europe, but remains discreet and rare in modern gardens, though it is a true botanical relic from ancient times.
Where to buy it
Plant in spring or early autumn, avoiding spells of intense heat. Pick a plant with healthy foliage and roots that are not exposed. Best time: March, April, May, September.
Add this plant to my garden →Plants from the same family
- Adder's tongueOphioglossum vulgatum
- Botrypus virginianusBotrypus virginianus
- Leathery grapefernSceptridium multifidum
- Cut-leaved GrapefernSceptridium dissectum
- Least Adder's-tongueOphioglossum lusitanicum
- Lanceleaf grapefernBotrychium lanceolatum
Tips generated and checked by Viridia — adapt them to your local climate.