UK compost
What compost for wood fern 'the king' in the UK?
Dryopteris affinis 'The King'
More about wood fern 'the king' in the UK
Which compost wood fern 'the king' needs
For wood fern 'the king' the mix to buy is peat-free multipurpose compost cut roughly half-and-half with horticultural grit or perlite. A peat-free woodland mix of leaf mould or composted bark, loam and grit holds moisture while draining. Tolerant of acidic to neutral pH. Rich organic matter supports the tall crested fronds.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 wood fern 'the king' 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?
Wood Fern 'The King' 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 wood fern 'the king' soil & potting-mix guide.
Compost for Wood Fern 'The King' in the UK — frequently asked questions
What compost should I use for wood fern 'the king' in the UK?
Use peat-free multipurpose compost cut roughly half-and-half with horticultural grit or perlite. A peat-free woodland mix of leaf mould or composted bark, loam and grit holds moisture while draining. Tolerant of acidic to neutral pH. Rich organic matter supports the tall crested fronds. 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 wood fern 'the king'?
Not on its own — multipurpose compost holds too much water for wood fern 'the king' 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 wood fern 'the king' perfectly well — they dry a little faster at the surface, so check moisture by feel rather than by the look of the top.
Does wood fern 'the king' need grit or perlite added?
Yes — wood fern 'the king' 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 wood fern 'the king' need?
Always a pot with drainage holes. Humus-rich, moisture-retentive, free-draining 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 wood fern 'the king' care
See the full wood fern 'the king' care guide, its UK watering and UK hardiness.