UK compost
What compost for tuscan blue rosemary in the UK?
Rosmarinus officinalis 'Tuscan Blue'
More about tuscan blue rosemary in the UK
Which compost tuscan blue rosemary needs
For tuscan blue rosemary the mix to buy is peat-free multipurpose compost cut roughly half-and-half with horticultural grit or perlite. Thrives in lean, alkaline, sandy or gravelly soil. Rich, wet soils produce fast but frost-tender growth. Add grit to clay soils to improve drainage. Excellent for raised beds, gravel gardens, and terracotta containers.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 tuscan blue rosemary 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?
Tuscan Blue Rosemary 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 tuscan blue rosemary soil & potting-mix guide.
Compost for Tuscan Blue Rosemary in the UK — frequently asked questions
What compost should I use for tuscan blue rosemary in the UK?
Use peat-free multipurpose compost cut roughly half-and-half with horticultural grit or perlite. Thrives in lean, alkaline, sandy or gravelly soil. Rich, wet soils produce fast but frost-tender growth. Add grit to clay soils to improve drainage. Excellent for raised beds, gravel gardens, and terracotta containers. 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 tuscan blue rosemary?
Not on its own — multipurpose compost holds too much water for tuscan blue rosemary 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 tuscan blue rosemary perfectly well — they dry a little faster at the surface, so check moisture by feel rather than by the look of the top.
Does tuscan blue rosemary need grit or perlite added?
Yes — tuscan blue rosemary 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 tuscan blue rosemary need?
Always a pot with drainage holes. Poor to moderately fertile, sharply drained sandy or gritty soil, pH 6.0–8.0. 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 tuscan blue rosemary care
See the full tuscan blue rosemary care guide, its UK watering and UK hardiness.