UK compost
What compost for foothill penstemon 'margarita bop' in the UK?
Penstemon heterophyllus
More about foothill penstemon 'margarita bop' in the UK
Which compost foothill penstemon 'margarita bop' needs
For foothill penstemon 'margarita bop' the mix to buy is peat-free multipurpose compost. Requires excellent drainage above all else. Grows naturally in rocky, gravelly, and sandy soils. Heavy clay or moisture-retentive soils must be amended with coarse grit. Tolerates a range of pH from slightly acidic to neutral (6.0-7.5).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 foothill penstemon 'margarita bop' 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?
Foothill Penstemon 'Margarita BOP' 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 foothill penstemon 'margarita bop' soil & potting-mix guide.
Compost for Foothill Penstemon 'Margarita BOP' in the UK — frequently asked questions
What compost should I use for foothill penstemon 'margarita bop' in the UK?
Use peat-free multipurpose compost. Requires excellent drainage above all else. Grows naturally in rocky, gravelly, and sandy soils. Heavy clay or moisture-retentive soils must be amended with coarse grit. Tolerates a range of pH from slightly acidic to neutral (6.0-7.5). 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 foothill penstemon 'margarita bop'?
Yes. A good peat-free multipurpose compost is exactly right for foothill penstemon 'margarita bop'. 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 foothill penstemon 'margarita bop' perfectly well — they dry a little faster at the surface, so check moisture by feel rather than by the look of the top.
Does foothill penstemon 'margarita bop' 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 foothill penstemon 'margarita bop' need?
Always a pot with drainage holes. Sharply drained, lean to average sandy or gravelly 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 foothill penstemon 'margarita bop' care
See the full foothill penstemon 'margarita bop' care guide, its UK watering and UK hardiness.