UK compost
What compost for red riding hood mandevilla in the UK?
Mandevilla sanderi 'Red Riding Hood'
More about red riding hood mandevilla in the UK
Which compost red riding hood mandevilla needs
For red riding hood mandevilla the mix to buy is peat-free multipurpose compost cut roughly half-and-half with horticultural grit or perlite. Excellent drainage is paramount. Use a quality multipurpose compost blended with 30-40% coarse perlite or horticultural grit. Avoid dense, moisture-retentive mixes. A neutral to slightly acidic pH (6.0-7.0) is acceptable. Refresh container compost annually with a topdressing or by repotting into the next size container in spring.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 red riding hood mandevilla 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?
Red Riding Hood Mandevilla does not want a rich, water-holding compost — it wants sharp drainage. Cut peat-free multipurpose roughly half-and-half with horticultural grit, sharp sand or perlite, and always pot into a container with drainage holes. A "cactus and succulent" bagged mix is a ready-made shortcut.
For the full recipe, pH and drainage detail (US wording), see the red riding hood mandevilla soil & potting-mix guide.
Compost for Red Riding Hood Mandevilla in the UK — frequently asked questions
What compost should I use for red riding hood mandevilla in the UK?
Use peat-free multipurpose compost cut roughly half-and-half with horticultural grit or perlite. Excellent drainage is paramount. Use a quality multipurpose compost blended with 30-40% coarse perlite or horticultural grit. Avoid dense, moisture-retentive mixes. A neutral to slightly acidic pH (6.0-7.0) is acceptable. Refresh container compost annually with a topdressing or by repotting into the next size container in spring. 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 red riding hood mandevilla?
Not on its own — multipurpose compost holds too much water for red riding hood mandevilla and will rot the roots. Cut it roughly 50:50 with horticultural grit, sharp sand or perlite so it drains fast.
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 red riding hood mandevilla perfectly well — they dry a little faster at the surface, so check moisture by feel rather than by the look of the top.
Does red riding hood mandevilla need grit or perlite added?
Yes — red riding hood mandevilla must have sharp drainage. Add about one part horticultural grit or perlite to one part compost, and always use a pot with drainage holes.
What pot and drainage does red riding hood mandevilla need?
Always a pot with drainage holes. Fast-draining, gritty potting mix. 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 red riding hood mandevilla care
See the full red riding hood mandevilla care guide, its UK watering and UK hardiness.