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Sea holly (Eryngium planum) is a tough plant, surviving in extreme cold and poor soils. It has thick, spiky leaves and steel blue or white flowers that resemble thistle plants.
Eryngium maritimum, the sea holly or sea eryngo, or sea eryngium, is a perennial species of flowering plant in the family Apiaceae and native to most European coastlines. It resembles a thistle in appearance because of its burr-shaped inflorescences. Despite its common name, it is not a true holly but an umbellifer.
Its leaves are dark green, stiff, with sharp spines at the end of each deep lobe: very much like those of holly (Ilex). Flowers are blue, purple or white, and occur in spikes terminal on the branches. The fruit is a square-shaped capsule, which explodes when ripe, projecting the seeds up to two metres from the plant. Seeds are off-white and flat.
The genus name Eryngium was established by Linnaeus in 1753 where he mentioned eight species, including two from America (E. aquaticum, E. foetidum).Linnaeus, in Genera Plantarum (1754), cited his source of the name Eryngium as being from Joseph Tournefort’s Institutiones rei herbariae (1700).
Try these dramatic sea holly varieties for year-long displays of thistle-style flower heads and highly textural foliage
Eryngium ebracteatum is an evergreen herbaceous perennial growing to a height of 1.5 meters. The species has grey-green lance shaped leaves which in contrast to other South American Eryngium are almost or entirely spineless.
Eryngium bourgatii, the Mediterranean sea holly (also known as Pyrenean eryngo), is a species of flowering plant in the family Apiaceae native to Andorra, France and Spain, as well as parts of the Levant, Morocco and Turkey. [1] It is an herbaceous perennial, growing to 15–45 cm (6–18 in) tall.
This plant generally reaches about 30–70 centimetres (12–28 in) in height, [2] with a maximum of 100 centimetres (39 in). The basal leaves are oval or heart-shaped, 10–15 centimetres (3.9–5.9 in) wide and 13–17 centimetres (5.1–6.7 in) long, [ 2 ] with toothed hedges and a long petiole.
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