Eryngium planum Blue Glitter seeds - Flat Sea Holly
Eryngium planum Blue Glitter seeds - Flat Sea Holly
Eryngium planum Blue Glitter seeds - Flat Sea Holly
Eryngium planum Blue Glitter
Flat Sea Holly, Blue Eryngo, Blue Sea Holly
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Description
Eryngium planum 'Blue Glitter' is a perennial blue thistle species also known as flat sea holly. This variety, very interesting for its beauty and performance, quickly reaches maturity, is very floriferous, and its superb blue is more intense. All these qualities have been rewarded with a Gold Medal Fleuroselect. 'Blue Glitter' develops numerous steel blue flowers in summer, on silver-blue floral spikes. Its captivating colour is even more appreciated in its preferred conditions: full sun, in poor, rocky, and fairly dry soil. This architectural and highly decorative plant is appreciated in slightly wild areas of the garden or in a rockery. Beautiful fresh or dried bouquets can then be made with this charming plant. Sow in a pot from March-April or sow directly in place from May to July.
Eryngium planum or Eryngium armatum, called flat sea holly, is a plant of the Apiaceae family, just like celery and carrot. It is a perennial herbaceous plant. Native to the mountains of central Europe, in the wild, it is found in dry and sunny places, in very well-drained gravelly or sandy soil. With an upright and bushy habit, the 'Blue Glitter' blue thistle quickly reaches about 80 cm in height and 50 cm in spread. Its crown develops a rosette of evergreen basal, petiolate, ovoid leaves with a heart-shaped base, thick, serrated, dark green and shiny. Tall branched, dark blue-grey stems adorned with a few small thornless, spineless leaves, rise from the basal rosettes. Flowering occurs in June-July, at the end of these branches. It takes the form of ovoid inflorescences 2 cm in diameter, composed of a multitude of tiny azure blue flowers, surrounded at the base by thin toothed bracts of the same blue, with metallic reflections. This flowering attracts many pollinating insects. Eryngium planum easily self-sows in light and well-drained soils.
The Wild Blue Thistle does not live very long (especially in fertile and moist soil) but naturally self-sows. In a countryside garden, its colour and design are appreciated alongside tall mulleins with yellow flowers, small annual nigellas with enchanting blue, catmints, and shrubby salvias, but also with cosmos or roses. In a contemporary garden, it looks superb with ornamental grasses. The cut flowers are splendid in dried bouquets. Note that 'Blue Glitter' seeds do not require vernalisation.
Eryngium planum Blue Glitter seeds - Flat Sea Holly in pictures
Flowering
Foliage
Plant habit
Botanical data
Eryngium
planum
Blue Glitter
Apiaceae
Flat Sea Holly, Blue Eryngo, Blue Sea Holly
Cultivar or hybrid
Planting and care
Sow the seeds of Eryngium Blue Glitter from February to July, in trays, pots, etc. in a special seed soil in a propagator or a warm place to maintain an optimal temperature of 18-20 °C. Cover the seeds with a thin layer of vermiculite or soil. Do not exclude the light. Germination may be slow. Enclose the sowing in a polythene bag and maintain at 15-18°C for 2 weeks, then place it in the refrigerator (not the freezer) for 3 to 6 weeks. After this step, return the sowing to the recommended germination temperature. If germination does not occur within 6 to 10 weeks, return it to the refrigerator for another 3 to 6 weeks.
Regularly check your sowing stored in the refrigerator and immediately remove seeds showing signs of germination.
Transplant the young plants when they are large enough to handle into 8 cm diameter pots. Let them grow under a cold frame and plant them in the garden the following spring. Maintain a spacing of 30 cm between each plant. Choose a sunny exposure and well-drained soil.
You can also try direct sowing in place from May to July in groups of 2 to 3 seeds. Germination in 20 to 30 days.
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).
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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