UK compost
What compost for rhynchostylis retusa in the UK?
Rhynchostylis retusa
More about rhynchostylis retusa in the UK
Which compost rhynchostylis retusa needs
For rhynchostylis retusa the mix to buy is peat-free multipurpose compost cut roughly half-and-half with horticultural grit or perlite. Grow bare-root in an open slatted basket so the abundant thick aerial roots hang free and dry rapidly after watering, as for Vanda and other Rhynchostylis. Dense potting media rots the roots, so avoid it; any medium used should be minimal and very coarse to preserve airflow.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 rhynchostylis retusa 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?
Rhynchostylis retusa 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 rhynchostylis retusa soil & potting-mix guide.
Compost for Rhynchostylis retusa in the UK — frequently asked questions
What compost should I use for rhynchostylis retusa in the UK?
Use peat-free multipurpose compost cut roughly half-and-half with horticultural grit or perlite. Grow bare-root in an open slatted basket so the abundant thick aerial roots hang free and dry rapidly after watering, as for Vanda and other Rhynchostylis. Dense potting media rots the roots, so avoid it; any medium used should be minimal and very coarse to preserve airflow. 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 rhynchostylis retusa?
Not on its own — multipurpose compost holds too much water for rhynchostylis retusa 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 rhynchostylis retusa perfectly well — they dry a little faster at the surface, so check moisture by feel rather than by the look of the top.
Does rhynchostylis retusa need grit or perlite added?
Yes — rhynchostylis retusa 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 rhynchostylis retusa need?
Always a pot with drainage holes. Bare-root in a slatted basket (no medium). 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 rhynchostylis retusa care
See the full rhynchostylis retusa care guide, its UK watering and UK hardiness.