UK compost
What compost for calathea rufibarba blue grass in the UK?
Goeppertia rufibarba 'Blue Grass'
More about calathea rufibarba blue grass in the UK
Which compost calathea rufibarba blue grass needs
For calathea rufibarba blue grass the mix to buy is peat-free multipurpose compost cut roughly half-and-half with horticultural grit or perlite. Coir or peat-free base with fine bark and perlite gives moisture retention plus aeration. Slightly acidic (pH 6.0-6.5). Use a pot with drainage to prevent waterlogging.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 calathea rufibarba blue grass 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?
Calathea Rufibarba Blue Grass 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 calathea rufibarba blue grass soil & potting-mix guide.
Compost for Calathea Rufibarba Blue Grass in the UK — frequently asked questions
What compost should I use for calathea rufibarba blue grass in the UK?
Use peat-free multipurpose compost cut roughly half-and-half with horticultural grit or perlite. Coir or peat-free base with fine bark and perlite gives moisture retention plus aeration. Slightly acidic (pH 6.0-6.5). Use a pot with drainage to prevent waterlogging. 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 calathea rufibarba blue grass?
Not on its own — multipurpose compost holds too much water for calathea rufibarba blue grass 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 calathea rufibarba blue grass perfectly well — they dry a little faster at the surface, so check moisture by feel rather than by the look of the top.
Does calathea rufibarba blue grass need grit or perlite added?
Yes — calathea rufibarba blue grass 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 calathea rufibarba blue grass need?
Always a pot with drainage holes. Airy, moisture-retentive, free-draining 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 calathea rufibarba blue grass care
See the full calathea rufibarba blue grass care guide, its UK watering and UK hardiness.