Creeping sedums can form attractive mats in sunny, freely draining places. Their succulent foliage makes them useful for rock gardens, edges and some containers, but not every plant sold as “sedum” is a low ground cover. Choose the species first, then match its hardiness and growing conditions to the site.
1. Choose a creeping stonecrop
White stonecrop, Sedum album, is one example of a low, spreading plant with small fleshy leaves and summer flowers. Other stonecrops differ in height, foliage color and rate of spread. Read the botanical name and mature dimensions instead of buying on a photograph alone.
Many taller border plants formerly called sedums are now placed in Hylotelephium. They can be good flowering perennials, but they will not make the same close mat as a creeping stonecrop. Their familiar late-summer flower display should not be used as the flowering calendar for all sedums.
Compare the NC State description of white stonecrop with the RHS guide to upright hylotelephiums when deciding which form you need. Check local invasive-plant guidance for a spreading species before planting it near natural areas.
2. Find a suitable site and planting time
Good drainage is central to success. A sunny rock-garden edge can suit a creeping stonecrop, whereas a low spot that stays wet may lead to rot. Some species tolerate partial shade, but do not assume every sedum will grow densely in it.
Plant during a mild period when the roots can establish without severe heat or frozen ground. Spring is often convenient; locally suitable autumn planting is another option for hardy plants. Remove persistent weeds before planting, because extracting them from an established mat is harder.
A raised container or raised bed may be more practical than trying to make a persistently wet site suitable. Do not bury plants deeply or add a small pocket of loose material into a waterlogged hole and assume the drainage problem has been solved.
3. Start seeds with species-specific instructions
Seeds are an option for suitable species, but plugs or small plants give a more predictable layout and faster initial coverage. Seed-grown plants may also differ from a named cultivar. Check whether the plant you want is normally propagated vegetatively.
Follow the seed supplier’s directions for sowing depth, temperature and any pretreatment. Small stonecrop seeds should not be given a universal garden spacing or buried under a thick layer of soil. Sow in a clean, well-draining propagation medium and avoid washing the seed away.
Keep conditions suitable for germination without leaving the medium waterlogged. Move seedlings into brighter growing conditions as appropriate and harden them off before planting outside. There is no reason to till an established bed 15 inches deep simply to sow sedum seed.
4. Use cuttings, divisions or rooted plants
The RHS profile for Sedum album lists seed, division and softwood cuttings as propagation options. Use healthy material and clean tools. Insert a prepared cutting shallowly enough to keep leaves above the medium, with sufficient stem contact to root. Planting depth matters: burying succulent foliage can encourage decay.
Keep new cuttings in suitable bright conditions and monitor moisture while they root. Do not treat an unrooted cutting as though it already has the drought tolerance of an established outdoor mat. Wait for a functioning root system before transplanting it into a difficult site.
For a rooted plant, make a hole that accommodates the roots and set the top of the root ball at the surrounding soil level. Firm gently and water to settle the soil. Space plants for the mature spread listed for that species or cultivar; six inches is not a rule for all stonecrops. Leave access to weed between them while they fill in.
5. Maintain the cover without overfeeding
Check new plants for drying while they establish. Once rooted, many creeping stonecrops tolerate dry periods, but container plants and recently divided plants need closer attention. Let the growing medium drain and adjust watering to conditions rather than following a fixed weekly calendar.
Do not automatically add rich compost and fertilizer every spring. Excess fertility is unnecessary for many stonecrops, and both organic and manufactured fertilizers can cause problems when misused. Choose any feeding from the plant’s needs and the product directions.
Trim growth that crosses an edge or smothers a neighboring plant, and remove weeds before they seed. A sedum mat may reduce open space for weeds, but it does not prevent all weeds, pests or disease. Inspect thinning or rotting patches and correct the cause before replanting.
For alternative plants suited to different light and moisture conditions, see our ground-cover guide. A successful ground cover is one that fits the site, not one expected to overcome unsuitable conditions.
