Blechnum penna-marina - Alpine Water Fern
Blechnum penna-marina - Alpine Water Fern
Blechnum penna-marina - Alpine Water Fern
Blechnum penna-marina - Alpine Water Fern
Blechnum penna-marina - Alpine Water Fern
Blechnum penna-marina
Alpine Water Fern, Pinque, Hard Fern
The small ferns have arrived in good condition, they seem to be recovering well.
Aurélie, 30/05/2023
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Description
Blechnum penna-marina is a hardy and creeping fern native to New Zealand and Australia, comfortable in moist to wet soils. This species forms a carpet of almost exclusively composed rosettes of linear sterile fronds, with a satin-like appearance and a beautiful dark green colour. They are evergreen, tough, and give a very clear appearance to the vegetation. This fern makes an excellent ground cover in wet humus-rich rockeries, in a sunny or very bright location.
Blechnum penna-marina is a plant of the family Blechnaceae, native to Oceania but also widespread in South America (Argentina, Chile) where it is commonly called Pinque or Punque. Its natural habitat consists mainly of wet, marshy, or waterlogged places, located in subalpine regions, where snow and frost are frequent.
This pretty little fern anchored on a creeping rhizome forms slightly loose rosettes of tough, narrow sterile fronds, divided into 2 rows of elongated pinnules, arranged like fish scales and of a dark green colour. These rosettes will not exceed 20cm (8in) in height, with a minimum span of 40 to 50cm (16 to 20in), much more over time. Then, in summer, the juvenile fronds appear in the centre of the clump, displaying a particularly bright green colour, tinged with pink and purple towards their tips. This species almost never produces fertile fronds and reproduces mainly vegetatively.
Less common than other species such as male and female ferns, this pretty creeping fern thrives on the edge of water points and sunny places where water constantly flows. It will easily settle in a damp and semi-shaded rockery, in soil with little limestone, or near a water point, in the company of Rodgersia, Petasites, silverweed, with its foot adorned with 'Chameleon' Houttuynia cordata. It is also a very romantic plant, perfect for filling the surroundings of a small waterfall or the mossy remains of a stone building, nestled in the hollow of the stones.
Blechnum penna-marina - Alpine Water Fern in pictures
Foliage
Plant habit
Botanical data
Blechnum
penna-marina
Blechnaceae
Alpine Water Fern, Pinque, Hard Fern
Austroblechnum microphyllum
Oceania
Planting and care
Plant Blechnum penna-marina in spring or autumn, in a soil rich in humus, slightly calcareous or acidic, constantly moist or even waterlogged, in partial shade or in non-scorching sunlight. This species tolerates sunlight well if the soil is constantly moist, but it will be more vibrant in partial shade. It is not difficult to cultivate in a damp rockery, where it naturalizes easily. Although native to the southern hemisphere, this species requires a cool winter period and a climate with marked temperature fluctuations. A montane climate will suit it very well.
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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