UK compost
What compost for gypsum butterwort in the UK?
Pinguicula gypsicola
More about gypsum butterwort in the UK
Which compost gypsum butterwort needs
For gypsum butterwort the mix to buy is peat-free multipurpose compost cut roughly half-and-half with horticultural grit or perlite. Use a mix of 50% coarse perlite and 50% coarse sand or fine grit with a small addition of powdered gypsum to replicate its natural substrate. Avoid peat-heavy mixes, which retain too much moisture. Good drainage is essential.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 gypsum butterwort 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?
Gypsum Butterwort 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 gypsum butterwort soil & potting-mix guide.
Compost for Gypsum Butterwort in the UK — frequently asked questions
What compost should I use for gypsum butterwort in the UK?
Use peat-free multipurpose compost cut roughly half-and-half with horticultural grit or perlite. Use a mix of 50% coarse perlite and 50% coarse sand or fine grit with a small addition of powdered gypsum to replicate its natural substrate. Avoid peat-heavy mixes, which retain too much moisture. Good drainage is essential. 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 gypsum butterwort?
Not on its own — multipurpose compost holds too much water for gypsum butterwort 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 gypsum butterwort perfectly well — they dry a little faster at the surface, so check moisture by feel rather than by the look of the top.
Does gypsum butterwort need grit or perlite added?
Yes — gypsum butterwort 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 gypsum butterwort need?
Always a pot with drainage holes. Mineral gypsum-rich, low-nutrient 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 gypsum butterwort care
See the full gypsum butterwort care guide, its UK watering and UK hardiness.