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Eryngium oliverianum

Eryngium oliverianum
Sea Holly, Eryngo

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1 reviews

Disappeared without a trace in a flowerbed; my investigation yielded no results (and I'm not proud of it).

Eliane G., 17/10/2017

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This plant carries a 12 months recovery warranty

More information

Graden Merit
Eryngium oliverianum is grown for its beauty and its great resistance to cold.  It is a perfect thistle in dry gardens with a wild appearance.
Height at maturity
90 cm
Spread at maturity
30 cm
Exposure
Sun
Hardiness
Hardy down to -15°C
Soil moisture
Dry soil
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Best planting time February to March, September to October
Recommended planting time March to May, September to November
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Flowering time July to September
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Description

A hybrid variety, cultivated for its beauty and high cold resistance, Eryngium x oliverianum has many advantages to being incldued in wild-looking dry gardens.

 

Called sea holly or ornamental thistle, Eryngium x oliverianum is a tall 90cm (35in) high perennial that likes light, chalky and even rocky soils.

The sturdy stems are often navy blue and bear sumptuous conical umbels of grey-blue flowers crowned with finely cut, electric blue bracts. Fresh or dried, the flowers are highly prized by florists. The olive green foliage, variegated with silver veins, measures about 10cm (4in) in diameter.

 

Grow it in light, well-drained, even chalky soil in the sun alongside Gaura lindheimeri 'Snowstorm', Verbascum bombyciferum 'Polarsommer', and Salvia nemorosa 'Caradonna'.

Eryngium oliverianum in pictures

Eryngium oliverianum (Foliage) Foliage

Flowering

Flower colour blue
Flowering time July to September
Good for cut flowers Cut flower blooms

Foliage

Foliage persistence Deciduous
Foliage colour green

Plant habit

Height at maturity 90 cm
Spread at maturity 30 cm
Growth rate normal

Botanical data

Genus

Eryngium

Species

oliverianum

Family

Apiaceae

Other common names

Sea Holly, Eryngo

Origin

Cultivar or hybrid

Product reference89951

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Planting and care

Eryngium oliverianum is certainly the most cold-resistant species of thistle. It requires a rocky or sandy soil, rather poor, rather chalky, as well as a sunny position. Its lifespan will be shorter the heavier, wetter and more compact the soil.

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Planting period

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

Intended location

Suitable for Shaded rockery, Woodland edge, Undergrowth
Type of use Back of border
Hardiness Hardy down to -15°C (USDA zone 7b) Show map
Ease of cultivation Amateur
Planting density 5 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 stalks as they grow.
Pruning Pruning recommended once a year
Pruning time August to September
Overwinter Can be left in the ground
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