Eryngium planum

Sea Holly, Blue Eryngo

Hardy Perennial

What is Hardy Perennial?
70% (4 Reviews)

Steel-blue flowers

Long-lasting blooms

Loved by pollinating insects

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Description How to Grow More Info Delivery Reviews
Commonly known as Sea Holly, this thistle-like perennial produces upright, branching stems of thimble-sized, steel-blue flowers surrounded by spiny bracts. From July to early autumn, these long-lasting blooms provide a valuable source of nectar for butterflies and pollinating insects. Eryngium planum makes fabulous gap filler for the middle of herbaceous borders, where it will happily mingle with other perennials. Perfect for sunny borders, including coastal locations, or planted in wildlife areas and cut flower gardens. Height: 90cm (36"). Spread: 45cm (18").

Height Up to 90cm (36in)
Spread Up to 45cm (18in)

Hardy Perennial

cottage gardenswildlife gardenscut flower gardencoastal garden

full sun

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Flowering Months


6 bare root Eryngium Planum plants (KC2059)
3 bare root Eryngium Planum plants (kb3512)

Grow sea holly plants on light, well drained soil in full sun. Eryngium plants particularly dislike cold, wet soil in winter which may cause the crown to rot. If planting on heavy soils, dig in plenty of coarse grit to improve drainage prior to planting.
Feed and water regularly throughout the growing season until plants are fully established. Leave faded eryngium flower heads in place until spring to benefit from the winter interest they will add to your borders. In cold wet soils, use a cloche to protect the crown of the plant from winter rainfall. Lift and divide overcrowded clumps of eryngium in spring. Only lift it when necessary as sea holly can be slow to re-establish.

Seeds and garden supplies will normally be delivered within the time period stated against each product as detailed above. Plants, bulbs, corms, tubers, shrubs, trees, potatoes, etc. are delivered at the appropriate time for planting or potting on. Delivery times will be stated on the product page above, or in your order acknowledgement page and email.

Orders for packets of seed incur a delivery charge of £2.99.

Orders which include any other products will incur a delivery charge of £4.99.

Where an order includes both packets of seeds and other products, a maximum delivery charge of £6.99 will apply - regardless of the number of items ordered.

Large items may incur a higher delivery charge - this will be displayed in your shopping basket.

Please see our Delivery page for further details, and more information on different charges that may apply to certain destinations.

For more information on how we send your plants please visit our Helpful Guide on plant sizes.

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