Sea Holly Plant Care How To Grow A Sea Holly Plant

Eryngiums need plenty of sunshine and free-draining soil. They can tolerate poor soil, and a spot at the foot of a wall is a good position as the soil will remain dry over winter. It's also a good idea to plant eryngiums away from the edge of a border or path, as their spikes can be quite sharp.

Where does sea holly grow best?
Does sea holly dieback in winter?
Is Sea Holly invasive?
Can you take cuttings from sea holly?
Should I cut back sea holly?
How do you take care of a sea holly plant?

Where does sea holly grow best?

Eryngium prefers dry, poor to moderately fertile, well-drained soils with the exception of Eryngium pandanifolium (Giant Sea Holly) which prefers moist soils. Good drainage is critical or your plant will die off from root rot. Most Sea Holly species are reliably perennial in Hardiness Zones 4 - 9.

Does sea holly dieback in winter?

When it blooms

Summer-flowering sea hollies provide a long-lasting flowerhead that eventually browns and fades, giving months of value. These sea hollies die down completely in winter and, given good drainage, will return every year.

Is Sea Holly invasive?

Eryngium Sea Holly self-sows readily by dropping its flower seeds on the ground, but it is not invasive. If the Sea Holly seeds are started indoors, transplant the seedlings where you want them to grow when they are quite small. The Eryngium plants have taproots, so they won't transplant well once mature.

Can you take cuttings from sea holly?

Eryngium, or sea holly, is a plant that can be propagated by root cuttings.

Should I cut back sea holly?

Selective cutting back in autumn can retain the dried, bleached flowerheads of plants, while removing material showing signs of decay or fungal growth. Examples include: such as Eryngium (sea holly), Phormium (New Zealand flax) and the foliage and flowers of ornamental grasses.