Plant Focus: Sedum (Hylotelephium)
A drought-tolerant succulent perennial that carries colour, structure and pollinators well into autumn
Sedum is a large genus of succulent plants in the stonecrop family, Crassulaceae, with species found across much of the northern hemisphere. It ranges from low, mat-forming stonecrops that hug rocks and walls to taller, clump-forming border plants grown for their late flowers and bold seed heads. The taller border types were reclassified some decades ago into the genus Hylotelephium, though most growers and gardeners still know and sell them as sedum.
The feature that defines the genus is the fleshy, water-storing foliage, which lets these plants cope with heat, drought and poor soil that would defeat many perennials. The border sedums carry flat heads of tiny star-shaped flowers from late summer into autumn, in shades of pink, rose, red and white that deepen to russet and copper as they age. The flower heads then dry and stand through winter, holding their shape against frost and low light.
Sedum performs well across a range of planting styles, from gravel gardens and green roofs to mixed borders, prairie schemes and large commercial drifts. The low, carpeting species make dependable ground cover and roof planting, while the taller border types give structure and late colour at a time when much of a scheme is going over. Most prefer free-draining soil and an open, sunny position, and once established they need very little water.
The genus is also one of the most valuable groups for late-season wildlife. The open flower heads are easy for insects to feed on, and they are at their most useful in late summer and autumn when many other nectar plants have finished. Bees, hoverflies and butterflies such as the small tortoiseshell and red admiral feed heavily on them, building up reserves before winter, and the standing seed heads later give cover to overwintering insects.
Key Characteristics:
✓ Succulent perennial with fleshy, water-storing foliage
✓ Flat heads of star-shaped flowers in pink, rose, red or white
✓ Late-summer to autumn flowering, ageing to russet and copper
✓ Dried seed heads stand through winter for structure
✓ Prefers full sun and free-draining soil
✓ Very drought tolerant once established
✓ Highly valuable to late-season bees and butterflies
Did You Know?
The flat flower heads open just as most summer nectar plants are fading, which makes sedum one of the most important autumn food sources for butterflies such as the small tortoiseshell and red admiral, feeding to build up reserves before they hibernate through winter.
Sedum in landscaping
Sedum earns its place in landscape design through the combination of late colour, structure and low maintenance it brings to a scheme. The taller border types flower when summer perennials are fading, extending the season of interest into autumn, and their dried heads then carry a planting through winter when little else holds its form. The low, carpeting species give reliable evergreen or semi-evergreen cover on ground where more demanding plants would fail.
In commercial landscapes, sedum copes with drought, poor soil and heat with very little intervention, which suits low-input schemes, gravel and paved settings, and the thin growing medium of a green roof. For projects where reliable seasonal performance and minimal upkeep matter, it is a sensible and hard-working choice.
Popular Sedum varieties we recommend
Hylotelephium ‘Herbstfreude’ (syn. ‘Autumn Joy’)
Hylotelephium ‘Herbstfreude’ (syn. ‘Autumn Joy’)
A robust, clump-forming perennial and the most widely grown of the border sedums, reaching around 60cm with fleshy grey-green leaves and flat heads of rose-pink flowers from late summer. The flowers deepen to copper and brick-red as autumn goes on, then dry to russet seed heads that stand through winter. Bees and butterflies feed heavily on the open flowers. A dependable choice for the middle of a border or in large drifts.
Hylotelephium ‘Matrona’
An upright sedum reaching around 70cm, with purple-flushed stems and thick, bronze-grey leaves that carry colour long before the flowers arrive. Flat heads of pale dusky-pink flowers open in late summer and age to deeper tones as the season turns, drawing bees and hoverflies while they are open. The strong stems hold well without staking and keep their shape into winter, so the plant still reads as structure once the flowers have gone over. Full sun and free-draining soil suit it best, and the foliage colour is stronger where the light is unobstructed. Great for adding structure to a mixed border.
Hylotelephium telephium ‘Purple Emperor’
A striking perennial grown as much for its foliage as its flowers, with dark purple, almost black stems and leaves that keep their colour through the season, reaching around 40cm. Dusky pink flowers open above the dark foliage in late summer and are well worked by bees. The colour holds truest in full sun and fades towards green in shade. Useful for deep foliage colour in a border or gravel scheme.
Hylotelephium ‘Matrona’
Hylotelephium telephium ‘Purple Emperor’
Hylotelephium spectabile ‘Brilliant’
Commonly known as the ice plant, Hylotelephium spectabile ‘Brilliant’ carries broad, flat heads of bright rose-pink flowers above pale blue-green foliage, reaching around 45cm. It is one of the best sedums for pollinators, drawing bees, hoverflies and butterflies in numbers through late summer and autumn. Prefers full sun and free-draining soil.
Sedum spathulifolium ‘Cape Blanco’
A low, mat-forming stonecrop grown for its rosettes of silvery, powder-blue foliage, reaching only a few centimetres in height, with small yellow flowers in early summer. Its tight, drought-tolerant habit suits green roofs, gravel, wall tops and the front edge of a scheme.
Sedum spurium ‘Fuldaglut’
A vigorous, spreading stonecrop that forms a dense mat of bronze-tinted green leaves, topped with deep red flowers in summer and reaching around 10cm. Fast to establish and quick to knit together, it makes reliable ground cover and green-roof planting on poor, dry soils.
Hylotelephium spectabile ‘Brilliant’
Sedum spathulifolium ‘Cape Blanco’
Sedum spurium ‘Fuldaglut’
How to grow and care for Sedum
Sedum is one of the easiest perennials to grow, and most of its problems come from soil that is too rich or too wet rather than from neglect. All types prefer an open, sunny position and free-draining soil, and they cope well with poor, stony or shallow ground where other plants struggle. Heavy, fertile or waterlogged soil is the main thing to avoid, since it encourages soft growth and can rot the roots over winter.
On rich soil the taller border sedums tend to grow lax and flop open at the centre as the heavy flower heads develop. Cutting the stems back by about a third in late spring, a technique often called the Chelsea chop, keeps plants shorter, sturdier and self-supporting. Watering is only needed while plants establish in their first season, after which they are among the most drought-tolerant perennials available.
Maintenance is minimal. The dried flower heads are best left standing through winter for structure and wildlife value, then cut back to ground level in early spring as new growth appears. Clumps can be lifted and divided every few years to keep them vigorous and to increase stock. Feeding is rarely necessary and often counterproductive, since lean soil produces the sturdiest plants.
Pests and diseases
Sedum is generally healthy and trouble-free, and a well-sited plant in free-draining soil usually performs reliably for years.
Root and stem rot are the most common problems, almost always linked to wet or poorly drained soil rather than disease, and are best prevented by choosing an open, free-draining position. Vine weevil can affect the roots of plants grown in containers, where the grubs feed unseen over winter, and fresh compost with a biological control where needed keeps them in check.
Slugs and snails may graze young shoots in spring, though established clumps are usually robust enough to outgrow minor damage. Aphids occasionally gather on soft new growth but rarely cause lasting harm.
If you would like more information on the Sedum varieties we grow and sell, speak to the G Team today.