Eryngium planum
Flat sea Holly
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Flat sea Holly (Eryngium planum) - Description
Eryngium planum (flat sea holly), is a species of flowering plant in the family Apiaceae, native to central and southeastern Europe to central Asia. It is an herbaceous perennial thistle growing to 50 cm (20 in) with branched silvery-blue stems, and numerous small blue conical flowerheads surrounded by spiky bracts in summer.
Flat sea Holly (Eryngium planum) - Blooming
Sea hollies look different according to where they are found. Species from wet, marshy areas have greenish white flowers with small bracts. Others usually form basal rosettes, with spiny leaves, and cylindrical umbels of stalkless flowers.
Flat sea Holly (Eryngium planum) - Growth
Annuals, biennials, and evergreen and deciduous perennials, found both in dry and moist areas. Sea hollies grow best in full sun.
Flat sea Holly (Eryngium planum) - Planting
When ripe, sow seeds in containers in a cold frame. Cold frames are protective structures, located outside for propagating and growing plants. Conduct division in spring. Division entails propagating a plant by splitting it into 2 or more parts. Each part has its own root system and more than one shoot or dormant bud. The plants usually take some time to re-establish. Can also propagate perennials from root cuttings in late winter.
Flat sea Holly (Eryngium planum) - Pest
Eryngium is vulnerable to slugs, snails, root rot, and powdery midlew.
Flat sea Holly (Eryngium planum) - Interesting facts
There are around 230 species of Eryngium, native to dry, rocky sites and coastal areas in Europe, northern Africa, Turkey, central Asia, China, and Korea. They are also found in wet marshy grasslands in Mexico, Brazil, and Argentina.
Flat sea Holly (Eryngium planum) - Soil and irrigation
Different species of Eryngium have varying cultivation requirements. Some need dry, poor to moderately fertile, well-drained soil, while others do best in moist, fertile, soil with good drainage. Protect the former from excess winter moisture.
