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Eryngium giganteum 'Miss Willmott's Ghost' - Kew Pollination Collection

Eryngium giganteum | Sea Holly

This product is produced and supplied in association with Thompson & Morgan

These packets are produced in association with Kew Gardens

Ornate flower-cones are loved by pollinating insects

Thrives in hot sunny spots

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Description Sowing More Info Delivery

Thompson & Morgan is delighted to work alongside the Royal Botanic Gardens, Kew to offer special seed collections to home gardeners. This Kew Pollinators Collection has been specially selected by The Royal Botanic Gardens, Kew.

Eryngium giganteum 'Miss Willmott's Ghost' is well worth growing for its architectural flower-cones, each encircled by a spikey, ornate bract. The pale silver-green stems rise above steely, heart-shaped foliage. This biennial or short-lived perennial will happily seed over the years to produce stunning drifts.

Sea Holly thrives on well-drained soils and this one no exception. Grow Eryngium giganteum in gravel gardens or dotted among swaying grasses for a dramatic textural contrast. The tall stems make a useful addition to dried flower arrangements, but spare some stems in the border, where pollinating insects will benefit from their nectar-rich blooms. Height: 100cm (39"). Spread: 30cm (12").


1 Packet (30 Seeds) (KB7570)

Sow Eryngium from February to July on the surface of a good seed compost, lightly cover with a dusting of compost or vermiculite, and gently firm down. Place in a propagator at a temperature of 65-70F (18-20C), or seal inside a polythene bag for 14 days. Do not exclude light as this aids germination.

Germination can be slow. If germination doesn’t occur after 2 weeks then move the seeds to a refrigerator for 3-6 weeks. Return to the recommended germination temperature. If germination does not occur in 6-10 weeks, then return to the fridge for a further 3-6 weeks. Examine regularly whilst in the fridge and remove immediately the seeds show signs of germinating.

When seedlings are large enough to handle, transplant and grow them on in cooler conditions until large enough to move outdoors after all risk of frost has passed.

Grow on in a cold frame and plant out the following spring on well-drained soil in full sun.

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 £6.99.

Where an order includes both packets of seeds and other products, a maximum delivery charge of £7.99 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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