UK compost
What compost for acer rubrum 'autumn blaze' in the UK?
Acer rubrum 'Autumn Blaze'
More about acer rubrum 'autumn blaze' in the UK
Which compost acer rubrum 'autumn blaze' needs
For acer rubrum 'autumn blaze' the mix to buy is peat-free multipurpose compost. More tolerant of soil variation than straight red maple thanks to its silver maple parentage, handling clay, sand and a wide pH range. Still performs best on moist, slightly acid soil and can show mild chlorosis on very alkaline ground.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 acer rubrum 'autumn blaze' 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?
Acer rubrum 'Autumn Blaze' 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 acer rubrum 'autumn blaze' soil & potting-mix guide.
Compost for Acer rubrum 'Autumn Blaze' in the UK — frequently asked questions
What compost should I use for acer rubrum 'autumn blaze' in the UK?
Use peat-free multipurpose compost. More tolerant of soil variation than straight red maple thanks to its silver maple parentage, handling clay, sand and a wide pH range. Still performs best on moist, slightly acid soil and can show mild chlorosis on very alkaline ground. 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 acer rubrum 'autumn blaze'?
Yes. A good peat-free multipurpose compost is exactly right for acer rubrum 'autumn blaze'. 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 acer rubrum 'autumn blaze' perfectly well — they dry a little faster at the surface, so check moisture by feel rather than by the look of the top.
Does acer rubrum 'autumn blaze' 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 acer rubrum 'autumn blaze' need?
Always a pot with drainage holes. Adaptable, moist, well-drained soil. 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 acer rubrum 'autumn blaze' care
See the full acer rubrum 'autumn blaze' care guide, its UK watering and UK hardiness.