Eryngium agavifolium 17cm / 2L Plants - Outdoor GROW TROPICALS
Eryngium agavifolium Plants - Outdoor GROW TROPICALS
Agave-leaved Sea Holly

Eryngium agavifolium

£13.99
Hardy in the UKSun-lovingEvergreenLoved by pollinators
Pot size
17cm / 2L £13.99

FREE tracked delivery on orders over £60

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Description

The Eryngium agavifolium, or agave-leaved sea holly, is one of the most striking architectural perennials you can grow for a hot, sunny border. It forms a bold evergreen rosette of long, sword-shaped leaves edged with sharp, agave-like teeth, and in summer it sends up branched stems topped with cylindrical, greenish-white thimble flowerheads. The effect is pure structure, a fountain of spiky foliage crowned by cool green cones that hold for weeks.

Native to Argentina and rated RHS H4, it is hardy across most of the UK, shrugging off temperatures to around -10C once established given sharp drainage. Because the rosette is evergreen it earns its place all year, keeping form through winter when so much of the border has died back. It is a natural partner for other hardy exotics and looks especially at home threaded through exotic border plants.

Wonderfully drought tolerant once settled, it thrives on poor, free-draining ground where fussier plants struggle, making it a star of gravel schemes and one of our favourite drought tolerant plants. Its green summer cones are magnets for bees and hoverflies, so it sits happily among plants for pollinators, while its emphatic silhouette makes it a keystone of any architectural foliage planting.

For a sense of how this evergreen perennial shifts with the seasons, see our guide to what to expect from hardy exotics. Every plant we supply is nursery-grown, carefully selected for a healthy crown and strong roots, and packed with care to arrive in superb condition.

Live Arrival Guarantee

All plants are covered by our 7-day live arrival guarantee. We pack every order in protective, sustainable packaging designed to keep your plants safe in transit, and every plant is checked before it ships. On the rare occasion something is not right on arrival, we will make it good, provided the plant is still in its original nursery pot.

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What to Expect

Seasonal by nature: what to expect

  • Grown outdoors, the way nature intended. Weather-tested and hardened in real UK conditions, so they thrive in your garden. A few marks on the older leaves are normal, the sign of a tough, real plant rather than a flaw.
  • It follows the seasons. Depending on when you order, your plant may arrive cut back, dormant or leafless. That's healthy: dormancy is the ideal time to plant.
  • Posted, not posed. Big leafy plants like bananas and gingers may be trimmed or gently folded to travel safely. It does the plant no harm, and it powers away again in spring.

Not sure what to expect from yours? Dormant, cut-back or weather-marked plants are all perfectly healthy and normal. Read what to expect through the seasons

Delivery & returns

Order by 1pm Monday to Friday for same day dispatch. Every plant travels in protective, plant-safe packaging with tracked delivery.

Changed your mind? See our Return Policy.

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How to care for Agave-leaved Sea Holly

Plant me in full sun and I will stand a UK winter outdoors.

In their words

What our customers say

Arrived just like the photos - maybe even fuller. Healthy, well-acclimated, and straight into my collection with no issues.

Emily P.

Flawless leaves, stunning variegation, and clearly cared for by experts. It’s already a talking point in my home office.

James R.

Hard to find rare plants that are pet-safe. Ours arrived in perfect condition and looks amazing without any worry.

Sophie L.
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About Agave-leaved Sea Holly

Eryngium agavifolium needs full sun and well-drained soil. It is hardy to around −10°C, standing an average UK winter outdoors.

Good for

Architectural Coastal & Exposed Dry & Gravel Gardens Exotic Borders Wildlife & Pollinators

Hardiness

TenderVery hardy

RHS H4 · Hardy Exotic · down to around −10°C

hardy across most of the UK, asking only for sharp drainage to shrug off frost.

Position

Full sunEast-facingSouth-facingWest-facingExposedSheltered

full sun for the tightest rosette and strongest flower stems, in either exposed or sheltered sites.

Soil

ChalkLoamSandWell-drainedAcid pHAlkaline pHNeutral pH

any sharply drained soil, from chalk to sand, across the full pH range, since standing winter moisture is what it least tolerates.

Watering

Water through the first summer to settle the roots, then largely leave it to its own devices, as it becomes notably drought tolerant once established. Avoid overwatering and rich feeding, which soften the growth and blur the crisp, architectural habit. Read moreShow less

Water through the first summer to settle the roots, then largely leave it to its own devices, as it becomes notably drought tolerant once established. Avoid overwatering and rich feeding, which soften the growth and blur the crisp, architectural habit.

Mature size

Height1-1.5 m
Spread0.5-0.6 m

Reaches full size in 2-5 years

Growth habit

Clump-forming

Flowering

Jul-Sep · Green

Seasonal colour

Foliage

Evergreen

Pruning

Evergreen sea holly. Cut spent flower stems back once they have finished and set seed, and remove tatty outer leaves in early spring.

Toxicity

The leaf margins carry sharp, spiny teeth that can scratch or prick, so site it away from paths and wear gloves when handling. No reported toxicity to people or pets.

Native range

Argentina

Family

Apiaceae

Also known as

Eryngium agavifolium

Genus

Eryngium
Good to know

Frequently Asked Questions

Is Eryngium agavifolium evergreen?

Yes. Unlike many border perennials it holds a bold evergreen rosette of toothed, sword-shaped leaves right through winter, so it keeps structure in the garden all year rather than dying back to the ground.

How hardy is Eryngium agavifolium?

It carries an RHS hardiness rating of H4, which makes it hardy across most of the UK down to around -10C once established. Winter wet is a bigger risk than cold, so give it sharp drainage. See our guide on what to expect from hardy exotics for seasonal detail.

Where is the best place to plant agave-leaved sea holly?

Give it full sun and a sharply drained soil. It shines in gravel gardens, dry borders and coastal plots, and once its deep roots settle it copes with drought better than most, earning a place among our drought tolerant plants.

How big does Eryngium agavifolium grow?

Expect an evergreen rosette that lifts to around 1.5 m tall when the branched flower stems appear, with a compact spread of roughly 0.6 m. It reaches full size in about two to five years.

Is Eryngium agavifolium good for pollinators?

Very. The green thimble flowerheads are alive with bees and hoverflies through summer, which makes it a reliable choice among our plants for pollinators.

Can I grow Eryngium agavifolium in a pot?

Yes. Use a deep container and a free-draining, gritty compost so the taproot has room and never sits wet. It makes a striking evergreen centrepiece in a large pot, so browse the rest of our plants for pots for companions.

Does my plant come with a pot?
Your plant will arrive in its nursery grow pot — the plastic pot it's been growing in. We don't include a decorative pot as standard, and there's a good reason for that: it means you get to choose one that fits your space and style, rather than being stuck with something that doesn't suit your home.

It also means you're not paying extra for a pot you might not want. The nursery pot is perfectly fine to keep your plant in for a while, just pop it inside a decorative cover pot or cache pot and you're good to go. When you're ready to repot (usually after a growing season or when roots start poking out the bottom), you can move it into something more permanent with fresh soil.

If you're not sure what size cover pot to go for, check the pot selector tool listed above, you'll want a decorative pot that's a centimetre or two wider than that to give it a comfortable fit.
How big will my plant be when it arrives?
Every plant on our site includes the pot size (e.g. 12cm) and, where possible, an approximate height. That's the most reliable way to set your expectations, photos can sometimes make a plant look larger or smaller than it really is.

If you're thinking "that sounds quite small for the price," here's something worth knowing: younger, smaller plants almost always adapt better to your home than larger ones. They adjust faster to your light and humidity, put out new growth more quickly, and tend to establish stronger root systems long-term. A plant that grows into your space will usually outperform one that was already big when it arrived.

That said, every plant is an individual. The one you receive may vary slightly in height, shape, or fullness compared to the photo, that's the nature of living things, not a quality issue. We select healthy, well-established specimens, and if you ever feel your plant doesn't match what you were expecting, just get in touch and we'll take a look.
What makes your plants different from the supermarket or garden centre?
There's a big difference between a plant that's been sitting under on a retail shelf and one that's been looked after and cared for by people who specialise in exactly this.

Our plants are grown in house or sourced from specialist nurseries, many of them varieties you simply won't find at your local garden centre or supermarket. Before anything leaves us, it's checked over by our horticultural team to make sure it's healthy, well-rooted, and ready to thrive in your home. We're not shifting volume off a pallet, we're choosing plants we'd want to keep ourselves.

When you buy from a supermarket, you get a plant and a generic care label. When you buy from us, you get the knowledge that comes with it, detailed care guidance, a team you can actually contact if something isn't going right, and the confidence that what's arriving has been looked after properly from the moment it was grown to the moment it reaches your door.

We're a specialist nursery first, not a retailer that happens to sell plants. That's the difference, and you'll see it the moment you open the box.
What should I do when my plant arrives?
First things first, unbox it as soon as you can. Plants don't love being in dark boxes any more than you would, and the sooner yours is out and breathing, the better.

Remove all the packaging carefully, give the soil a check with your finger, and water lightly if it feels dry. Then find it a spot with appropriate light, but avoid putting it straight into harsh direct sun or next to a radiator. Think of it like arriving somewhere new after a long journey: it needs a moment to adjust.

It's completely normal for your plant to look a little tired or droopy after transit. This is called transit stress, and most plants bounce back within a week or two. You might see a yellow leaf or some drooping, don't panic, and resist the urge to overwater or start repotting straight away.

Our advice for the first couple of weeks: leave it in its nursery pot, water it only when the top layer of soil feels dry, and let it acclimatise to your home's light, temperature, and humidity. Once it's settled in and showing signs of new growth, you can think about repotting or moving it to its permanent spot.

Every plant we sell comes with a care guide on the product page so you'll know exactly what it needs going forward. And if anything doesn't look right, get in touch with our team, we're always happy to help.
Will my plant survive being shipped?
Yes! and we go to serious lengths to make sure of it. Every plant is hand-packed by our team with protective wrapping and secure, custom-designed boxes to keep it stable and safe in transit. We've shipped hundreds of thousands of plants across the UK and our packaging methods have been refined over years to handle the bumps and jolts of delivery.

During colder months, we monitor weather forecasts and offer heat packs where needed to protect against frost. In extreme conditions, we may hold your order for a day or two rather than risk sending it out, we'd rather you wait an extra day than receive a stressed plant.

That said, plants are living things, and the occasional transit wobble can happen. If your plant arrives damaged or isn't in the condition you'd expect, just get in touch within 48 hours with a photo, and we'll make it right, whether that's a replacement or a full refund. No fuss.

The short version: we treat every box like it's going to someone who really cares about what's inside, because it is.
Why Grow Tropicals

Plants delivered the way they deserve

Packaged with Care

Packaged with Care

Every order is hand-packed in eco-friendly, protective packaging - refined through thousands of deliveries to ensure your plant arrives healthy, hydrated, and looking its best.

Backed by our Live Arrival Guarantee.

Perfect for Gifting

Perfect for Gifting

From rare collector’s pieces to easy-care favourites, our plants arrive fully potted and ready to enjoy. Add a personalised note at checkout for a thoughtful finishing touch.

Delivered fresh, beautiful, and gift-ready.

Sustainability at Heart

Sustainability at Heart

All plants are ethically sourced from trusted growers, never wild-collected. Every order ships carbon-neutral in minimal-waste packaging.

Good for your home - and the planet.

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