UK compost
What compost for prairie fire switch grass in the UK?
Panicum virgatum 'Prairie Fire'
More about prairie fire switch grass in the UK
Which compost prairie fire switch grass needs
For prairie fire switch grass the mix to buy is peat-free multipurpose compost. Thrives in lean, average garden soil and a broad pH range, from sand to heavy clay. Fertile soil encourages floppy growth, so avoid amending too richly.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 prairie fire switch 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?
Prairie Fire Switch Grass 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 prairie fire switch grass soil & potting-mix guide.
Compost for Prairie Fire Switch Grass in the UK — frequently asked questions
What compost should I use for prairie fire switch grass in the UK?
Use peat-free multipurpose compost. Thrives in lean, average garden soil and a broad pH range, from sand to heavy clay. Fertile soil encourages floppy growth, so avoid amending too richly. 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 prairie fire switch grass?
Yes. A good peat-free multipurpose compost is exactly right for prairie fire switch grass. 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 prairie fire switch 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 prairie fire switch grass 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 prairie fire switch grass need?
Always a pot with drainage holes. Average to poor, well-drained soil; tolerant of clay. 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 prairie fire switch grass care
See the full prairie fire switch grass care guide, its UK watering and UK hardiness.