Eryngium planum White Glitter seeds - Flat Sea Holly
Eryngium planum White Glitter seeds - Flat Sea Holly
Eryngium planum White Glitter seeds - Flat Sea Holly
Eryngium planum White Glitter
Blue Eryngo, Flat Sea Holly, Blue Sea Holly
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Description
Eryngium planum 'White Glitter' is a perennial blue thistle species also known as flat sea holly. This variety is a white-flowered form of the high-performing and award-winning 'Blue Glitter' variety. It produces superb ivory-silver flowers on silvery green branched floral stems. Its very bright colouring is even more appreciated in its preferred conditions: full sun, in poor, rocky, and fairly dry soil. This architectural, highly decorative 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 a pot from March-April or direct sow in place from May to July.
Eryngium planum or Eryngium armatum, known as flat sea holly, belongs to the Apiaceae family, just like celery and carrots. It is a perennial herbaceous plant with a 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 'White Glitter' thistle quickly reaches around 80 cm in height and 50 cm in spread. Its crown develops a rosette of ovoid, heart-shaped, thick, toothed, dark green, shiny leaves that remain evergreen in winter. Tall, dark, blue-grey, branched stems adorned with a few small thornless leaves rise from the basal rosettes. Flowering occurs in June-July at the end of these branches in the form of ovoid inflorescences of 2 cm in diameter, composed of numerous tiny azure blue flowers, surrounded at the base by thin toothed bracts of the same blue, with metallic highlights. This flowering attracts many pollinating insects. Eryngium planum readily self-seeds in light, well-drained soils.
The Wild Thistle does not live very long (especially in fertile, moist soil), but naturally self-seeds. In a countryside garden, its colour and design are appreciated alongside tall mulleins with yellow flowers, small annual love-in-a-mist nigellas with enchanting blue flowers, catmints, and shrubby salvias, as well as cosmos or roses. In a contemporary garden, it looks superb with grasses. The cut flowers are splendid in dried bouquets.
Eryngium planum White Glitter seeds - Flat Sea Holly in pictures
Flowering
Foliage
Plant habit
Botanical data
Eryngium
planum
White Glitter
Apiaceae
Blue Eryngo, Flat Sea Holly, Blue Sea Holly
Cultivar or hybrid
Planting and care
Sow the seeds of Eryngium White Glitter from February to July, in trays, pots, etc. in a special seed compost placed 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 the light. Germination may be slow. Enclose the sowing in a plastic 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, bring it back to the recommended germination temperature. If germination does not occur within 6 to 10 weeks, place it back in the refrigerator for another 3 to 6 weeks.
Regularly check any sowing stored in the refrigerator and immediately remove it if it shows signs of germination.
Prick out 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 out 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).
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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.