Moisture retentive soil
Well drained soil
A stately perennial, with rosettes of green heart shaped basal leaves exploding into tall umbels of large green flowers maturing to silver
The large cone thistle flower heads of this plant are green and white in colour, and produce plenty of nectar for bees. The flower stalks are very tall with the spiny, exotic Agave-like foliage....
As the popularity of Eryngiums continues unabated, 'Picos Amethyst' really stands out from the crowd for its stunning deep blue flowers, each distinguished by a ruff of long jagged bracts.
This is a stunning Eryngium with large silver bracts surrounding white thistle flowers in summer.
This Sea Holly has a slightly different inflorescence in that it is very spiny and it is silver while the thistle flower is cream.
The flower heads on this variety of Sea Holly are some of the biggest and most distinctive. The bracts around the thistle flower become an incredible blue along with the flower stems, and contrast ...
Producing a cloud of blooms, each with a steely blue central cone encircled with pointed silvery bracts on blue multi-branched stems, its striking display lasts from mid to late summer.
This plant really lives up to its name, 'Big Blue', the intensity of blue on the large flower heads is stunning.
It forms good sized clumps in a reasonably fertile soil in full sun, and is great ...
This wonderful sea holly, often known as 'Sapphire Blue' is a product of the cut flower trade and produces good large electric blue thistle flowers in mid summer.
A new and totally unique introduction of Sea Holly - the foliage of this Eryngium is a brilliant golden colour , it will become lime green if slightly shady. The flower spikes, stems and flower bracts