UK compost
What compost for aster 'monte cassino' in the UK?
Symphyotrichum ericoides 'Monte Cassino'
More about aster 'monte cassino' in the UK
Which compost aster 'monte cassino' needs
For aster 'monte cassino' the mix to buy is peat-free multipurpose compost. Not fussy about soil fertility — overly rich soil promotes lush foliage at the expense of flowers. Good drainage is essential; it will not tolerate 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 aster 'monte cassino' 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?
Aster 'Monte Cassino' 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 aster 'monte cassino' soil & potting-mix guide.
Compost for Aster 'Monte Cassino' in the UK — frequently asked questions
What compost should I use for aster 'monte cassino' in the UK?
Use peat-free multipurpose compost. Not fussy about soil fertility — overly rich soil promotes lush foliage at the expense of flowers. Good drainage is essential; it will not tolerate 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 aster 'monte cassino'?
Yes. A good peat-free multipurpose compost is exactly right for aster 'monte cassino'. 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 aster 'monte cassino' perfectly well — they dry a little faster at the surface, so check moisture by feel rather than by the look of the top.
Does aster 'monte cassino' 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 aster 'monte cassino' need?
Always a pot with drainage holes. Average, well-drained loam or sandy 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 aster 'monte cassino' care
See the full aster 'monte cassino' care guide, its UK watering and UK hardiness.