UK compost
What compost for compton's gibbaeum in the UK?
Gibbaeum comptonii
More about compton's gibbaeum in the UK
Which compost compton's gibbaeum needs
For compton's gibbaeum the mix to buy is peat-free multipurpose compost cut roughly half-and-half with horticultural grit or perlite. A blend of coarse horticultural sand or perlite with a small proportion of loam or cactus compost works well. Avoid peat-heavy mixes. Terra cotta pots and shallow containers help wick away moisture. Ensure drainage holes are unobstructed.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 compton's gibbaeum 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?
Compton's Gibbaeum 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 compton's gibbaeum soil & potting-mix guide.
Compost for Compton's Gibbaeum in the UK — frequently asked questions
What compost should I use for compton's gibbaeum in the UK?
Use peat-free multipurpose compost cut roughly half-and-half with horticultural grit or perlite. A blend of coarse horticultural sand or perlite with a small proportion of loam or cactus compost works well. Avoid peat-heavy mixes. Terra cotta pots and shallow containers help wick away moisture. Ensure drainage holes are unobstructed. 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 compton's gibbaeum?
Not on its own — multipurpose compost holds too much water for compton's gibbaeum 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 compton's gibbaeum perfectly well — they dry a little faster at the surface, so check moisture by feel rather than by the look of the top.
Does compton's gibbaeum need grit or perlite added?
Yes — compton's gibbaeum 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 compton's gibbaeum need?
Always a pot with drainage holes. Very gritty, low-nutrient succulent mix with 50–70% inorganic material. 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 compton's gibbaeum care
See the full compton's gibbaeum care guide, its UK watering and UK hardiness.