UK compost
What compost for eryngium giganteum 'silver ghost' in the UK?
Eryngium giganteum 'Silver Ghost'
More about eryngium giganteum 'silver ghost' in the UK
Which compost eryngium giganteum 'silver ghost' needs
For eryngium giganteum 'silver ghost' the mix to buy is peat-free multipurpose compost cut roughly half-and-half with horticultural grit or perlite. Tolerates lean, sandy, chalky and low-fertility ground. Sharp drainage prevents rot; lighten heavy soils with grit. Overly rich or wet soil shortens its already brief life.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 eryngium giganteum 'silver ghost' 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?
Eryngium giganteum 'Silver Ghost' 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 eryngium giganteum 'silver ghost' soil & potting-mix guide.
Compost for Eryngium giganteum 'Silver Ghost' in the UK — frequently asked questions
What compost should I use for eryngium giganteum 'silver ghost' in the UK?
Use peat-free multipurpose compost cut roughly half-and-half with horticultural grit or perlite. Tolerates lean, sandy, chalky and low-fertility ground. Sharp drainage prevents rot; lighten heavy soils with grit. Overly rich or wet soil shortens its already brief life. 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 eryngium giganteum 'silver ghost'?
Not on its own — multipurpose compost holds too much water for eryngium giganteum 'silver ghost' 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 eryngium giganteum 'silver ghost' perfectly well — they dry a little faster at the surface, so check moisture by feel rather than by the look of the top.
Does eryngium giganteum 'silver ghost' need grit or perlite added?
Yes — eryngium giganteum 'silver ghost' 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 eryngium giganteum 'silver ghost' need?
Always a pot with drainage holes. Poor to moderate, dry, free-draining 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 eryngium giganteum 'silver ghost' care
See the full eryngium giganteum 'silver ghost' care guide, its UK watering and UK hardiness.