Acanthus

Acanthus plants for bold architectural foliage and statuesque garden drama

Acanthus is one of the most commanding herbaceous perennials available to UK gardeners — a genus whose deeply lobed, glossy leaves have inspired classical architecture for over two thousand years and whose towering flower spikes bring genuine spectacle to borders from June to August. At Grasslands Nursery we grow one of the widest selections of Acanthus available to order online in the UK, from the familiar bear's breeches of cottage gardens to rarer species suited to more sheltered spots.

Whether you are planting a dramatic specimen in a sunny gravel garden, filling a shaded dry corner beneath established trees, or creating bold structural contrast alongside finer-textured perennials, there is an Acanthus to suit. Order online with confidence — our plants are grown on-site and dispatched in prime condition, ready to establish and reward you for decades.

Why choose Acanthus for your garden?

• Exceptionally long-lived and increasingly drought-tolerant once established — ideal for the drier summers now common across much of England.
• Foliage is architectural year-round in milder winters, with leaves that can reach 60–90 cm in length on vigorous species.
• Flower spikes typically reach 120–180 cm, creating a vertical accent rivalled by few other herbaceous plants.
• Attractive to bees and other pollinators — the hooded, purple-and-white flowers are particularly rich in nectar.
• Virtually pest-free and largely ignored by slugs — an important advantage in a UK garden setting.
• Seed heads persist attractively into autumn and winter, providing additional season-long interest.

Which Acanthus species should I choose?

Acanthus mollis is the most widely grown species in the UK, thriving in sun or partial shade on most well-drained soils. Its leaves are broader and softer than those of Acanthus spinosus, which produces more finely cut, spine-tipped foliage and flowers with particular freedom. Acanthus spinosissimus is similar but even more finely dissected and architectural — a rewarding choice for drier, sunnier positions. For sheltered gardens in the south and west, Acanthus hungaricus (syn. A. balcanicus) offers elegant, deeply divided leaves and a slightly more restrained habit. All species are herbaceous to semi-evergreen depending on winter severity.

Is Acanthus evergreen in the UK?

In most of the UK, Acanthus behaves as a herbaceous perennial — the foliage dies back after hard frosts and re-emerges vigorously in spring. In milder coastal gardens or sheltered town gardens in the south and west, plants can hold their leaves through winter and technically behave as semi-evergreen. Either way, established clumps are fully hardy throughout the UK (typically to around −15 °C) and the thick, fleshy roots survive even prolonged cold spells without any protection.

How and where should I plant Acanthus?

• Position: Full sun to partial shade. Acanthus mollis tolerates quite heavy shade but flowers less freely; A. spinosus prefers an open, sunny site.
• Soil: Any well-drained soil; performs particularly well on dry, alkaline, or chalky ground once established. Avoid waterlogged conditions in winter.
• Spacing: Allow 60–90 cm between plants — mature clumps spread steadily and resent disturbance once settled.
• Planting format: Supplied as pot-grown plants, ensuring year-round planting is possible and establishment is rapid.
• Depth: Plant at the same depth as in the pot; burying the crown too deeply can delay flowering.

How do I care for Acanthus after planting?

• Watering: Water regularly throughout the first growing season to aid establishment; once the plant is settled (usually after the second season), supplementary watering is rarely needed.
• Feeding: An annual mulch of well-rotted compost in late autumn or early spring is sufficient; avoid high-nitrogen feeds, which promote leaf growth at the expense of flowering.
• Pruning: Cut back spent flower stems to the base after flowering. Remove tired foliage in late autumn or leave it until early spring to provide some insulation for the crown.
• Dividing: Clumps rarely need division, but root sections removed in early spring can be potted on to create new plants easily.

Acanthus vs other architectural perennials — how does it compare?

If you are weighing up Acanthus against other bold foliage perennials, bear in mind that it offers a combination of dry-shade tolerance, genuine drought resilience, and towering flower spikes that few rivals match. Verbascum and Echinops provide similar height but lack the dramatic leaf presence; ornamental thistles share the architectural quality but are mostly biennial or short-lived. Acanthus, by contrast, forms an ever-more-impressive specimen with every passing year, making it one of the finest long-term investments available in the UK herbaceous border.