UK compost
What compost for blue heaven little bluestem in the UK?
Schizachyrium scoparium 'Blue Heaven'
More about blue heaven little bluestem in the UK
Which compost blue heaven little bluestem needs
For blue heaven little bluestem the mix to buy is peat-free ericaceous (lime-free) compost. Evolved on the thin, dry soils of North American prairies. Thrives in nutrient-poor, rocky, or sandy soils. Rich, fertile soils produce floppy plants and reduce the characteristic blue coloration. Avoid clay-heavy or waterlogged conditions.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 blue heaven little bluestem 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?
Blue Heaven Little Bluestem 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 blue heaven little bluestem soil & potting-mix guide.
Compost for Blue Heaven Little Bluestem in the UK — frequently asked questions
What compost should I use for blue heaven little bluestem in the UK?
Use peat-free ericaceous (lime-free) compost. Evolved on the thin, dry soils of North American prairies. Thrives in nutrient-poor, rocky, or sandy soils. Rich, fertile soils produce floppy plants and reduce the characteristic blue coloration. Avoid clay-heavy or waterlogged conditions. 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 blue heaven little bluestem?
No — blue heaven little bluestem 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 blue heaven little bluestem perfectly well — they dry a little faster at the surface, so check moisture by feel rather than by the look of the top.
Does blue heaven little bluestem 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 blue heaven little bluestem need?
Always a pot with drainage holes. Lean, dry to moderately moist, well-drained sandy or loamy soil; pH 5.5-7.5. 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 blue heaven little bluestem care
See the full blue heaven little bluestem care guide, its UK watering and UK hardiness.