UK compost
What compost for toothed fly bush in the UK?
Roridula dentata
More about toothed fly bush in the UK
Which compost toothed fly bush needs
For toothed fly bush the mix to buy is peat-free multipurpose compost. Neutral to acidic pH (4.5–5.5). No added fertiliser, compost, or bark. Roridula in the wild grows in nutrient-depleted sandstone fynbos soils; rich substrates stimulate rapid rotting of the woody base.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 toothed fly bush 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?
Toothed Fly Bush 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 toothed fly bush soil & potting-mix guide.
Compost for Toothed Fly Bush in the UK — frequently asked questions
What compost should I use for toothed fly bush in the UK?
Use peat-free multipurpose compost. Neutral to acidic pH (4.5–5.5). No added fertiliser, compost, or bark. Roridula in the wild grows in nutrient-depleted sandstone fynbos soils; rich substrates stimulate rapid rotting of the woody base. 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 toothed fly bush?
Yes. A good peat-free multipurpose compost is exactly right for toothed fly bush. 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 toothed fly bush perfectly well — they dry a little faster at the surface, so check moisture by feel rather than by the look of the top.
Does toothed fly bush 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 toothed fly bush need?
Always a pot with drainage holes. Nutrient-poor acidic mix: 2 parts peat or coco-coir to 1 part perlite. 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 toothed fly bush care
See the full toothed fly bush care guide, its UK watering and UK hardiness.