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Eryngium planum Seeds - Flat Sea Holly

Eryngium planum
Flat Sea Holly, Blue Eryngo

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A beautiful perennial thistle in azure blue and steel blue, whose colour captivates in full sun, in poor and rocky soil, rather dry. Its tough, dentate dark green leaves, often evergreen in winter, are arranged in a rosette. Rural and wild, this blue globe thistle works wonders in a border or rockery. It self-sows spontaneously in light soil. To be included in fresh or dried bouquets afterwards.
Flower size
10 cm
Height at maturity
80 cm
Exposure
Sun, Partial shade
Annual / Perennial
Perennial
Germination time (days)
18 days
Sowing method
Sowing under cover
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Sowing period January to March
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Flowering time July to September
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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

Flower colour blue
Flowering time July to September
Inflorescence Umbel
Flower size 10 cm
Bee-friendly Attracts pollinators
Good for cut flowers Cut flower blooms

Foliage

Foliage persistence Deciduous
Foliage colour blue

Plant habit

Height at maturity 80 cm
Spread at maturity 50 cm
Growth rate normal

Botanical data

Genus

Eryngium

Species

planum

Family

Apiaceae

Other common names

Flat Sea Holly, Blue Eryngo

Origin

Cultivar or hybrid

Product reference214710

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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.

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Sowing period

Sowing period January to March
Sowing method Sowing under cover
Germination time (days) 18 days

Intended location

Suitable for Meadow, Rockery
Type of use Border, Back of border, Slope
Hardiness Hardy down to -23°C (USDA zone 6a) Show map
Ease of cultivation Amateur
Exposure Sun, Partial shade
Soil pH Any
Soil moisture Dry soil, Draining, deep, even poor

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