UK compost
What compost for rose-painted calathea (dottie) in the UK?
Goeppertia roseopicta
More about rose-painted calathea (dottie) in the UK
Which compost rose-painted calathea (dottie) needs
For rose-painted calathea (dottie) the mix to buy is peat-free multipurpose compost. Use a moist but well-drained peaty potting mix, e.g. one part potting soil, one part peat or coco coir for moisture retention, and one part perlite or orchid bark for aeration. Slightly acidic pH suits it best. Repot in spring roughly once a year or when rootbound.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 rose-painted calathea (dottie) 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?
Rose-painted Calathea (Dottie) is straightforward: an ordinary peat-free multipurpose compost is right. For a big specimen or a pot it will live in for years, mixing in some loam-based John Innes No.2 or No.3 adds weight and holds nutrients longer. Ericaceous compost is not needed unless a plant is specifically a lime-hater.
For the full recipe, pH and drainage detail (US wording), see the rose-painted calathea (dottie) soil & potting-mix guide.
Compost for Rose-painted Calathea (Dottie) in the UK — frequently asked questions
What compost should I use for rose-painted calathea (dottie) in the UK?
Use peat-free multipurpose compost. Use a moist but well-drained peaty potting mix, e.g. one part potting soil, one part peat or coco coir for moisture retention, and one part perlite or orchid bark for aeration. Slightly acidic pH suits it best. Repot in spring roughly once a year or when rootbound. 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 rose-painted calathea (dottie)?
Yes. A good peat-free multipurpose compost is exactly right for rose-painted calathea (dottie). For a large or long-term pot you can mix in some John Innes No.2 or No.3 (loam-based) for extra weight and staying power.
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 rose-painted calathea (dottie) perfectly well — they dry a little faster at the surface, so check moisture by feel rather than by the look of the top.
Does rose-painted calathea (dottie) need grit or perlite added?
Not essential, but a couple of handfuls of perlite in the mix improves aeration and guards against overwatering — useful on a cool, damp British windowsill where compost stays wet longer.
What pot and drainage does rose-painted calathea (dottie) need?
Always a pot with drainage holes. Light, peat-based, well-draining mix, slightly acidic. 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 rose-painted calathea (dottie) care
See the full rose-painted calathea (dottie) care guide, its UK watering and UK hardiness.