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Eryngium planum Jade Frost

Eryngium planum Jade Frost
Flat Sea Holly, Blue Eryngo

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Only one young plant has produced flowers, the other two will have to make me wait.... I hope.

Jean Marc D., 21/11/2018

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This plant carries a 12 months recovery warranty

More information

Value-for-money
Perennial with green leaves with cream and pink edges, covered with a multitude of small head blue-violet flowers in the middle of summer. Unique and colourful, an extraordinary variety.
Flower size
2 cm
Height at maturity
60 cm
Spread at maturity
30 cm
Exposure
Sun
Hardiness
Hardy down to -23°C
Soil moisture
Dry soil
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Best planting time February to March, September to October
Recommended planting time February to April, September to November
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Flowering time July to September
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Description

Eryngium planum 'Jade Frost' is a perennial noted for its variegated foliage with perfectly stunning colours, the blue-green leaves are marginated with pink and then cream. The spiky violet-blue inflorescences are also very decorative.

 

This sea holly will reach a height of 60 cm (24in) and has highly branched flower stalks bearing flowers grouped in numerous small heads resembling delicate violet-blue stars between July and September. The spiny margins of the colourful bracts, resembling thistles, are the origin of its other common name, ornamental thistle.

From picturesque scenes to contemporary ones, its colours range from green to silver and its graphic design allow it to integrate into many situations. Ideally planted in full sun, Eryngium planum 'Jade Frost' loves heat and drought and adapts to all sunny soils with a chalky tendency, which are also well-drained and deep; it even tolerates coastal areas. What it dislikes most is moisture, especially during winter. To extend its decorative effect beyond the summer months outdoors, you can easily make dried bouquets as it retains its beautiful colours when dried.

Eryngium planum Jade Frost works well in a rock garden, flower bed, wild or contemporary garden alongside Gauras, Mulleins (Verbascums), Salvias or Perovskias, or a few Stipas.

Eryngium planum Jade Frost in pictures

Eryngium planum Jade Frost (Flowering) Flowering
Eryngium planum Jade Frost (Foliage) Foliage
Eryngium planum Jade Frost (Plant habit) Plant habit

Flowering

Flower colour mauve
Flowering time July to September
Inflorescence Flower head
Flower size 2 cm
Good for cut flowers Cut flower blooms

Foliage

Foliage persistence Deciduous
Foliage colour green

Plant habit

Height at maturity 60 cm
Spread at maturity 30 cm
Growth rate normal

Botanical data

Genus

Eryngium

Species

planum

Cultivar

Jade Frost

Family

Apiaceae

Other common names

Flat Sea Holly, Blue Eryngo

Origin

Cultivar or hybrid

Product reference802211

Other Eryngium - Eryngo

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Planting and care

Eryngium planum 'Jade Frost' should be planted from September to April in a well-drained, dry, poor and rocky soil in full sun. In heavy soil or in wet regions, mix compost, sand and gravel with your garden soil and plant in a raised bed. Don't forget to place gravel at the bottom of the hole for good drainage. It is sensitive to winter waterlogging.

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Planting period

Best planting time February to March, September to October
Recommended planting time February to April, September to November

Intended location

Suitable for Meadow, Rockery
Type of use Border
Hardiness Hardy down to -23°C (USDA zone 6a) Show map
Ease of cultivation Amateur
Planting density 6 per m2
Exposure Sun
Soil pH Neutral, Calcareous
Soil type Chalky (poor, alkaline and well-drained), Stony (poor and well-drained)
Soil moisture Dry soil, Well-drained and deep

Care

Pruning instructions Cut the flower stems as they grow.
Pruning Pruning recommended once a year
Pruning time August to September
Disease resistance Good
Overwinter Can be left in the ground
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