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Eryngium planum Neptunes Gold

Eryngium planum Neptune's Gold
Flat Sea Holly, Blue Eryngo

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Out of 3 plants, one didn't even have roots... disappointing.

Sébastien, 24/03/2024

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This plant carries a 12 months recovery warranty

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A new variety of ornamental thistle of great beauty, very unique with its bright yellow foliage and its blue flowers surrounded by yellow bracts. To be planted in the sun, in a regular, sandy and rocky, well-drained soil.
Flower size
2 cm
Height at maturity
60 cm
Spread at maturity
45 cm
Exposure
Sun
Hardiness
Hardy down to -23°C
Soil moisture
Dry soil
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Best planting time March to April
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 Neptune's Gold is a new and very bright variety, forming a beautiful, well-branched clump. Its spring leaves are bright yellow, then yellowish-green in summer. From July to September, it displays numerous bright blue umbels, surrounded by yellow bracts. A striking contrast between the yellow foliage and the purplish-blue flowers!

 

Eryngium planum is native to central and southeastern Europe, as well as central Asia, and belongs to the family Apiaceae. The cultivar 'Neptune's Gold' is a herbaceous perennial plant with a taproot, measuring about 60 cm (24in) tall and 45 cm (18in) wide. It forms a compact and bushy spreading clump, with semi-evergreen foliage. It has a rosette of divided basal leaves, initially bright yellow in spring, then yellow-green in summer. Its well-branched, erect stems are a bright golden yellow turning purplish-blue. From July to September, they bear numerous heads of beautiful violet-blue flowers. Its inflorescences measure 3 cm (1in) long and are cone-shaped, surrounded by narrow, toothed bracts, 2 to 3 cm (1in) long, which are golden yellow. Its flowers attract many pollinating insects.

 

This Eryngium appreciates the sun and poor, sandy, rocky, well-drained soils. Particularly decorative with its compact bushy habit, its very long blue flowering period, uninterrupted throughout the summer, and its splendid golden spiny foliage, this thistle will be the perfect companion for plants in poor, dry areas, such as grasses, false wallflowers, Perovskia, shrubby wallflowers, lavenders, Agapanthus, and garden irises, by choosing a yellow and blue colour scheme. However, it is advisable to plant it in the background of borders to avoid getting too close to its spines!  This blue thistle is one of the best plants for creating beautiful dried bouquets. Just cut the stems before the flowers fully open and hang them upside down to dry.

Eryngium planum Neptunes Gold in pictures

Eryngium planum Neptunes Gold (Foliage) Foliage
Eryngium planum Neptunes Gold (Plant habit) Plant habit

Flowering

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

Foliage

Foliage persistence Semi-evergreen
Foliage colour golden

Plant habit

Height at maturity 60 cm
Spread at maturity 45 cm
Growth rate normal

Botanical data

Genus

Eryngium

Species

planum

Cultivar

Neptune's Gold

Family

Apiacées

Other common names

Flat Sea Holly, Blue Eryngo

Origin

Cultivar or hybrid

Product reference807891

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Planting and care

Eryngium planum 'Neptune's Gold' is a perennial plant that is easy to grow under optimum conditions, and is perfectly hardy. It should preferably be planted in the spring, in a sunny location, in ordinary, slightly fertile, light, sandy or stony soil, with not too much limestone, which is not too dry but is especially well-drained.  It does not tolerate heavy and wet soils, especially during the winter season. Therefore, in the case of heavy soil or in a region that is too wet, it will be necessary to mix compost, sand, and gravel with the garden soil and plant it in a raised bed.  In order to ensure good drainage, it will be necessary to place a good layer of gravel at the bottom of the planting hole. After flowering, remove the faded flowers, unless you want the seeds to scatter in the garden, thus obtaining spontaneous sowing and new young plants. Eryngiums can be attacked by aphids on the stems and inflorescences, as well as on their roots, weakening the plants and sometimes causing them to wither (root rot). On the other hand, they can be susceptible to powdery mildew and attacked by snails and slugs.

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Planting period

Best planting time March to April
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 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, Very well drained

Care

Pruning No pruning necessary
Disease resistance Good
Overwinter Can be left in the ground
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