UK compost
What compost for hyacinthus orientalis 'city of haarlem' in the UK?
Hyacinthus orientalis 'City of Haarlem'
More about hyacinthus orientalis 'city of haarlem' in the UK
Which compost hyacinthus orientalis 'city of haarlem' needs
For hyacinthus orientalis 'city of haarlem' the mix to buy is peat-free multipurpose compost cut roughly half-and-half with horticultural grit or perlite. Moderately fertile, gritty, free-draining soil prevents rot; neutral to slightly alkaline pH (6.5-7.5) is ideal. Use bulb fibre or grit-amended compost in 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 hyacinthus orientalis 'city of haarlem' 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?
Hyacinthus orientalis 'City of Haarlem' 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 hyacinthus orientalis 'city of haarlem' soil & potting-mix guide.
Compost for Hyacinthus orientalis 'City of Haarlem' in the UK — frequently asked questions
What compost should I use for hyacinthus orientalis 'city of haarlem' in the UK?
Use peat-free multipurpose compost cut roughly half-and-half with horticultural grit or perlite. Moderately fertile, gritty, free-draining soil prevents rot; neutral to slightly alkaline pH (6.5-7.5) is ideal. Use bulb fibre or grit-amended compost in 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 hyacinthus orientalis 'city of haarlem'?
Not on its own — multipurpose compost holds too much water for hyacinthus orientalis 'city of haarlem' 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 hyacinthus orientalis 'city of haarlem' perfectly well — they dry a little faster at the surface, so check moisture by feel rather than by the look of the top.
Does hyacinthus orientalis 'city of haarlem' need grit or perlite added?
Yes — hyacinthus orientalis 'city of haarlem' 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 hyacinthus orientalis 'city of haarlem' need?
Always a pot with drainage holes. Fertile, well-drained 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 hyacinthus orientalis 'city of haarlem' care
See the full hyacinthus orientalis 'city of haarlem' care guide, its UK watering and UK hardiness.