UK compost
What compost for campanula persicifolia in the UK?
Campanula persicifolia
More about campanula persicifolia in the UK
Which compost campanula persicifolia needs
For campanula persicifolia the mix to buy is peat-free multipurpose compost. Adaptable to most garden soils that drain freely; tolerates neutral to alkaline conditions. Wet, heavy winter soil is the main cause of crown rot, so improve drainage on clay.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 campanula persicifolia 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?
Campanula persicifolia 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 campanula persicifolia soil & potting-mix guide.
Compost for Campanula persicifolia in the UK — frequently asked questions
What compost should I use for campanula persicifolia in the UK?
Use peat-free multipurpose compost. Adaptable to most garden soils that drain freely; tolerates neutral to alkaline conditions. Wet, heavy winter soil is the main cause of crown rot, so improve drainage on clay. 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 campanula persicifolia?
Yes. A good peat-free multipurpose compost is exactly right for campanula persicifolia. 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 campanula persicifolia perfectly well — they dry a little faster at the surface, so check moisture by feel rather than by the look of the top.
Does campanula persicifolia 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 campanula persicifolia need?
Always a pot with drainage holes. Fertile, well-drained loam. 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 campanula persicifolia care
See the full campanula persicifolia care guide, its UK watering and UK hardiness.