Eryngium agavifolium (Sea Holly) — Clump forming

Overview

Eryngium agavifolium is a clump forming perennial in the genus Eryngium, part of the Apiaceae family, with deciduous foliage. Eryngium agavifolium grows best in full sun, and tolerates most soils and any pH. Its UK hardiness is rated H5. Suggested uses include cottage and informal garden, coastal, gravel garden, wildlife gardens, cut flowers and flower borders and beds. It is native to Argentina Northeast and Argentina Northwest.

About

Eryngium agavifolium is a clump-forming member of the Apiaceae with deciduous foliage and a pronounced summer flowering period. It favours full sun and exposed positions on free-draining soils such as chalk, loam or sand. The plant tolerates a wide soil pH range and is classed H5 for UK hardiness. Use it where upright, architectural stems and reliable summer bloom are required.

About the genus

Eryngium is a genus of flowering plants in the family Apiaceae. There are about 250 species. The genus has a cosmopolitan distribution, with centres of diversity in the western Mediterranean, South America and Mexico.

Wikipedia contributors, "Eryngium", CC BY-SA 4.0 — Eryngium

In the garden

Eryngium agavifolium sits in the Apiaceae and forms steady clumps with deciduous leaves, producing its main display in summer from June to September. It performs best in full sun and in sites that are exposed rather than sheltered. Soils may be chalk, loam or sand, and the species tolerates acid, neutral and alkaline conditions provided drainage is good. Plant on a south-, west- or east-facing aspect where winter wet is avoided; that helps in its H5 hardiness rating, which equates to hardy in UK gardens. Give a free-draining position and avoid waterlogged ground — well-drained soil is important for winter survival and to keep crowns healthy. No specialist soil pH adjustments are necessary because it tolerates a broad range. Eryngium agavifolium has practical uses across gravel and coastal schemes, cottage and informal borders, and wildlife-friendly beds, and it also works well for cutting. Position it at the front or middle of a border where its upright flowering stems can be seen, and cut stems for arrangements when the heads are well formed to extend their use in the vase.

Growing conditions

Best soil and position for Eryngium

Sunlight: Full sun
Soil type: Chalk, Loam, Sand
Soil pH: Acid, Alkaline, Neutral
Soil moisture: Well-drained
Aspect: South-facing, West-facing, East-facing
Exposure: Exposed
UK hardiness: H5

Plant details

Eryngium agavifolium size, habit and characteristics

Plant type: Perennial
Habit: Clump forming
Foliage: Deciduous
Suggested uses: Cottage and informal garden, Coastal, Gravel garden, Wildlife gardens, Cut flowers, Flower borders and beds
Native to: Argentina Northeast, Argentina Northwest

Care notes

Pruning and caring for Eryngium agavifolium

Cultivation: Prefers full sun and well-drained soil; tolerates a wide pH range; drought tolerant once established
Pruning: Remove spent flower heads to encourage further blooming; cut back foliage in late autumn
Propagation: Seed, Root cuttings, Division
Pest resistance: Leaf and bud eelworms, Slugs and snails
Disease resistance: Root rot, Powdery mildews

Frequently asked questions

How do I grow Eryngium agavifolium?

Prefers full sun and well-drained soil; tolerates a wide pH range; drought tolerant once established.

Where is the best place to plant Eryngium agavifolium?

Eryngium agavifolium prefers full sun. It suits exposed positions.

What soil does Eryngium agavifolium need?

Eryngium agavifolium is adaptable and grows happily in most soil types, including chalk, loam and sand. It is happy in soil of any pH. Aim for soil that stays well-drained.