Flat Sea Holly Eryngium planum is a distinctive summer flowering perennial plant or thistle with silver-blue leaves and small blue conical flowerheads. The plants grow to approximately 50 cm. It is an ideal plant for sunny, south-facing gardens. Lovely to combine with Lychnis, Cosmea (Chocolate is very striking), Achillea, Verbena, Sedum, Echinacea and ornamental grass.This plant is delivered to you as a pot plant. The diameter of the pot will vary between 9 and 17 cm in diameter, depending on the available product. The plant is delivered to you in special protective packaging. The actual height of the plant you will receive, varies during the season. We guarantee robust and healthy plants that will flower immediately.