UK compost
What compost for russian comfrey in the UK?
Symphytum uplandicum
More about russian comfrey in the UK
Which compost russian comfrey needs
For russian comfrey the mix to buy is peat-free ericaceous (lime-free) compost. Thrives in deep, fertile, moist soils where its taproot can penetrate deeply to mine subsoil nutrients. pH 5.5–7.5. More productive in fertile, moisture-retentive ground than in thin, sandy soils, though it survives almost anywhere.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 russian comfrey 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?
Russian Comfrey is a lime-hater: it needs an acidic, lime-free ericaceous compost. In ordinary (limey) multipurpose it slowly yellows between the leaf veins as it locks out iron. Buy a bag labelled "ericaceous", and in a hard-water area water with rainwater where you can, since tap water is slightly alkaline.
For the full recipe, pH and drainage detail (US wording), see the russian comfrey soil & potting-mix guide.
Compost for Russian Comfrey in the UK — frequently asked questions
What compost should I use for russian comfrey in the UK?
Use peat-free ericaceous (lime-free) compost. Thrives in deep, fertile, moist soils where its taproot can penetrate deeply to mine subsoil nutrients. pH 5.5–7.5. More productive in fertile, moisture-retentive ground than in thin, sandy soils, though it survives almost anywhere. 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 russian comfrey?
No — russian comfrey needs an acidic, lime-free (ericaceous) compost. Standard multipurpose is too limey and will slowly cause yellowing between the leaf veins (lime-induced chlorosis). Buy a bag labelled "ericaceous".
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 russian comfrey perfectly well — they dry a little faster at the surface, so check moisture by feel rather than by the look of the top.
Does russian comfrey 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 russian comfrey need?
Always a pot with drainage holes. Deep, moisture-retentive, fertile loam to clay-loam; tolerates most soil types. 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 russian comfrey care
See the full russian comfrey care guide, its UK watering and UK hardiness.