Osmunda claytoniana - Fern
Osmunda claytoniana - Fern
Osmunda claytoniana
Interrupted Fern
Satisfactory quality, good recovery this spring, remains to verify the varietal authenticity (fertile fronds with interfoliar sori on mature subjects) which differentiates it from other species (O.regalis, O.cinnamomea...).
christian, 03/04/2026
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Description
The Clayton's Royal Fern (Osmunda claytoniana) is a large deciduous fern, particularly robust, which bears large light green fronds. It is a majestic plant that thrives in moist soil.
Native to North America and the Far East, it belongs to the family of Osmundaceae. The Clayton's Royal Fern is distinguished by its wide pale green leaflets as well as its sporangia, whose colour changes over time, ranging from blackish to yellow-green, then ending in rusty brown and disappearing.
Very hardy, it forms a stump with a very spreading crown that can easily reach 90cm (35in) in height and 60cm (24in) in width. This deciduous fern is both early and late: it is one of the first to unfurl its beautiful fronds in spring and remains unaffected by the first frosts. Its presence in the garden therefore extends over a long period.
The Clayton's Royal Fern tolerates almost all exposures: from deep shade to full sun, provided that the soil remains moist. It is known for its robustness, a quality that more than compensates for its relatively slow establishment.
It is a very easy plant to grow that you can plant in moist, humus-bearing soil with little limestone. It is essential in woodland settings, along with the Hart's Tongue Fern, Solomon's Seals, the Wood Anemone, or even with Hellebores.
Osmunda claytoniana - Fern in pictures
Foliage
Plant habit
Botanical data
Osmunda
claytoniana
Osmundaceae
Interrupted Fern
North America
Planting and care
Clayton's Fern accepts almost all exposures: from deep shade to full sun, as long as the soil remains moist. It is renowned for its robustness, a quality that more than compensates for its relatively slow establishment. It is an easy-to-grow plant that you will install in moist, humus-bearing soil without too much limestone.
Planting period
Intended location
Care
Planting & care advice
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Hardiness is the lowest winter temperature a plant can endure without suffering serious damage or even dying. However, hardiness is affected by location (a sheltered area, such as a patio), protection (winter cover) and soil type (hardiness is improved by well-drained soil).
In temperate climates, pruning of spring-flowering shrubs (forsythia, spireas, etc.) should be done just after flowering.
Pruning of summer-flowering shrubs (Indian Lilac, Perovskia, etc.) can be done in winter or spring.
In cold regions as well as with frost-sensitive plants, avoid pruning too early when severe frosts may still occur.
The harvesting period indicated on our website applies to countries and regions in USDA zone 8 (France, England, Ireland, the Netherlands).
In colder areas (Scandinavia, Poland, Austria...) fruit and vegetable harvests are likely to be delayed by 3-4 weeks.
In warmer areas (Italy, Spain, Greece, etc.), harvesting will probably take place earlier, depending on weather conditions.
The sowing periods indicated on our website apply to countries and regions within USDA Zone 8 (France, UK, Ireland, Netherlands).
In colder areas (Scandinavia, Poland, Austria...), delay any outdoor sowing by 3-4 weeks, or sow under glass.
In warmer climes (Italy, Spain, Greece, etc.), bring outdoor sowing forward by a few weeks.
The planting period indicated on our website applies to regions in USDA Zone 9a (East Coast and Midlands: Dublin, Wexford, Waterford, Kilkenny, Portlaoise). It will vary depending on where you live:
- On the west coast and in the north-west (Galway, Limerick, Sligo, Donegal, Westport), delay planting by 1 to 2 weeks in spring and bring it forward by 1 to 2 weeks in autumn compared to the dates given, preferably choosing periods without strong winds.
- In the inland hills and plateaus (Wicklow Mountains, Macgillycuddy’s Reeks, Connemara, Killarney), it is best to plant in spring (April–May) or autumn (September–October), avoiding periods of waterlogged soil in winter and strong winds, which pose the main risk to newly planted trees in these areas.
The flowering period indicated on our website applies to regions in USDA Zone 9a, such as the East Coast and Midlands, including Dublin, Wexford, Waterford, Kilkenny and Portlaoise.
This will vary depending on where you live:
- On the west coast and in the northwest (Galway, Limerick, Sligo, Donegal and Westport), it will be delayed by one to two weeks compared to the given dates, due to stronger Atlantic winds and less spring sunshine.
- In the inland hills and plateaus (the Wicklow Mountains, the Macgillycuddy's Reeks, Connemara and Killarney), flowering will be delayed by two to three weeks. Flowering mainly occurs between May and July, with the limiting factors being less frost and more of the excessive humidity, strong winds and lack of sunshine that are characteristic of these areas.
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