UK compost
What compost for fringed cliff stonecrop in the UK?
Prometheum fimbriatum
More about fringed cliff stonecrop in the UK
Which compost fringed cliff stonecrop needs
For fringed cliff stonecrop the mix to buy is peat-free multipurpose compost cut roughly half-and-half with horticultural grit or perlite. Use a 50:50 blend of coarse grit or pumice and loam-based compost. Replicating the rocky scree of its natural mountain habitat ensures the critical drainage this species requires. Containers must have drainage holes; top-dress with fine gravel.In British garden centres the bagged growing medium is sold simply as “compost” (multipurpose, ericaceous, or loam-based John Innes), which is a different thing from the rotted garden “compost” you make in a heap — for a pot you want the bagged kind.
Peat-free compost
Buy peat-free. The sale of peat compost to home gardeners is being phased out across the UK, and the RHS recommends peat-free on environmental grounds. A good peat-free multipurpose grows fringed cliff stonecrop perfectly well; the one habit to change is watering — peat-free dries faster at the surface while still moist below, so check by feel a knuckle deep rather than trusting the look of the top.
Ericaceous or multipurpose?
Fringed Cliff Stonecrop does not want a rich, water-holding compost — it wants sharp drainage. Cut peat-free multipurpose roughly half-and-half with horticultural grit, sharp sand or perlite, and always pot into a container with drainage holes. A "cactus and succulent" bagged mix is a ready-made shortcut.
For the full recipe, pH and drainage detail (US wording), see the fringed cliff stonecrop soil & potting-mix guide.
Compost for Fringed Cliff Stonecrop in the UK — frequently asked questions
What compost should I use for fringed cliff stonecrop in the UK?
Use peat-free multipurpose compost cut roughly half-and-half with horticultural grit or perlite. Use a 50:50 blend of coarse grit or pumice and loam-based compost. Replicating the rocky scree of its natural mountain habitat ensures the critical drainage this species requires. Containers must have drainage holes; top-dress with fine gravel. In UK garden centres this is sold simply as "compost" — the bagged growing medium, not garden-made leaf-mould — so match the description above rather than a brand.
Can I use ordinary multipurpose compost for fringed cliff stonecrop?
Not on its own — multipurpose compost holds too much water for fringed cliff stonecrop and will rot the roots. Cut it roughly 50:50 with horticultural grit, sharp sand or perlite so it drains fast.
Should the compost be peat-free?
Yes. Sales of peat compost to home gardeners are being phased out in the UK, and the RHS recommends peat-free for environmental reasons. Modern peat-free multipurpose composts grow fringed cliff stonecrop perfectly well — they dry a little faster at the surface, so check moisture by feel rather than by the look of the top.
Does fringed cliff stonecrop need grit or perlite added?
Yes — fringed cliff stonecrop must have sharp drainage. Add about one part horticultural grit or perlite to one part compost, and always use a pot with drainage holes.
What pot and drainage does fringed cliff stonecrop need?
Always a pot with drainage holes. Sharply draining gritty alpine mix. Stand it on a saucer, empty any water that collects after watering, and never leave the pot sitting in a full outer cover — waterlogged compost in a cool UK room is the commonest cause of root rot.
More fringed cliff stonecrop care
See the full fringed cliff stonecrop care guide, its UK watering and UK hardiness.