Eryngium planum Seeds - Flat Sea Holly
Eryngium planum Seeds - Flat Sea Holly
Eryngium planum
Flat Sea Holly, Blue Eryngo
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Description
The Eryngium planum is a perennial blue thistle species also known as flat sea holly. In summer, it produces numerous flowers resembling small azure blue pompoms on ramified floral spikes of a steel blue hue. Its captivating colour is best appreciated in its preferred conditions: full sun, in poor, rocky, and fairly dry soil. Graphic and highly decorative, this plant is valued in slightly wild areas of the garden or in a rockery. Beautiful fresh or dried bouquets can be made with this charming plant. Sow in buckets from March to April or sow directly in place from May to July.
The Eryngium planum or Eryngium armatum, also known as flat sea holly, belongs to the Apiaceae family, just like celery and carrot. It is a perennial herbaceous plant by its root. Native to the mountains of central Europe, in the wild, it is found in dry and sunny locations, in very well-drained gravelly or sandy soil. With an upright and bushy habit, the blue thistle quickly reaches about 80 cm in height by 50 cm in spread. Its stump develops a rosette of basal leaves with petioles, ovate with a heart-shaped base, thick, dentate, dark green, shiny, evergreen in winter. Tall stems of dark blue-grey colour, branched, adorned with a few small thorned and petioleless leaves, rise from the basal rosettes. Flowering occurs in June-July at the tips of these branches. It consists of ovoid inflorescences of 2 cm in diameter, composed of numerous tiny azure blue flowers, surrounded at the base by thin dentate bracts of the same blue, with metallic reflections. This flowering attracts numerous pollinating insects. The Eryngium planum readily self-seeds in light and well-drained soils.
The Wild Blue Thistle does not live very long (especially in fertile and moist soil), but self-seeds naturally where it thrives. In a cottage garden, its colour and design are appreciated alongside tall mulleins with yellow flowers, enchanting blue annual love-in-a-mist, catmints, and shrubby salvias, but also with cosmos or roses. In a contemporary garden, it looks stunning with ornamental grasses. The cut flowers are magnificent in dried bouquets.
Flowering
Foliage
Plant habit
Botanical data
Eryngium
planum
Apiaceae
Flat Sea Holly, Blue Eryngo
Cultivar or hybrid
Planting and care
Sow Eryngium seeds from February to July, in trays, pots, etc. in a special sowing compost that you place in a propagator or a warm place to maintain an optimal temperature of 18-20°C. Cover the seeds with a thin film of vermiculite or compost. Do not exclude light. Germination can be slow. Enclose the sowing in a polyethylene bag and keep at 15-18°C for 2 weeks, then place it in the refrigerator (not the freezer) for 3 to 6 weeks. After this step, bring the sowing back to the recommended temperature for germination. If germination does not occur within 6 to 10 weeks, place it back in the refrigerator for another 3 to 6 weeks.
Regularly check your stored seeds in the refrigerator and immediately remove seeds showing signs of germination.
Transplant the young plants when they are large enough to handle into 8cm (3.1in) diameter pots. Let them grow in a cold frame and plant them in the garden the following spring. Maintain a spacing of 30cm (11.8in) between each plant. Choose a sunny exposure and well-drained soil.
Cultivation: Eryngium giganteum grows in deep, dry, well-drained soil, even poor and rocky in hot and sunny situations.
Sowing period
Intended location
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).
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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.