Mitcheldean drives, specifically
Why a drive under the Forest canopy greens up before anyone else's.
Mitcheldean sits in a damp, wooded combe on the northern edge of the Forest of Dean, and that setting is the whole reason your drive looks the way it does. The village fills the head of the Longhope brook valley, hemmed in by rising, tree-covered ground — Plump Hill, the Stenders, Breakheart Hill — climbing out of the centre toward the woodland. It's a beautiful spot to live. It is, for a block-paved or gravel drive, a perfect algae factory.
The mechanism is simple. Black-green slime — gloeocapsa algae — and the soft moss that fills your joints both live on three things: shade, damp, and a steady supply of rotting organic matter. The Forest canopy delivers all three on a Mitcheldean drive without trying. The trees keep a great many drives in shade for most of the day, especially the north-facing ones tucked under the slopes; the valley floor holds moisture that open, higher ground sheds; and every autumn the leaf-fall off the surrounding woodland settles into the joints and the low corners, rotting down into a damp mulch that the moss feeds straight off. The result is a drive that goes green faster, and slimier, than the same paving would on open ground a few miles away — and a drive that, by the time most people pick up the phone, is genuinely slippery to walk on.
You see it most clearly on the shaded village drives and the steep lanes climbing out of the combe. A block-paved drive off Townsend or the Stenders, sitting under a beech or a sycamore, will carry a thick green-black film across the slabs and a dense moss line down every joint, with leaf-tannin staining ghosting out from where the leaves sat all winter. A gravel drive running up off Plump Hill collects leaf-mould between the stones until it's more mulch than gravel, and the algae binds it all into a slick, dark surface. None of it is dirt you can hose off — it's growth bonded into the surface, and it needs lifting out, not rinsing.
There's a second problem the canopy creates that's particular to the combe: the steep drives. A lot of Mitcheldean's drives run at a real gradient off the valley sides, and that changes how you can clean them. Blast a steep gravel or loose-laid drive with a high-pressure lance and you scour the stone and bedding straight downhill — you end up with bald patches at the top and a heap of shingle at the bottom. So on the steep and the gravel drives here we deliberately drop the pressure and work gently, lifting the algae and weed without washing the drive away. Method matters more than horsepower in this valley.
The honest part we tell every Mitcheldean customer up front: under this canopy, a clean alone won't last as long as it would on open ground. That's not a reason to skip it — a green, slippery drive is both an eyesore and a hazard — it's a reason to do it properly and then think seriously about a seal, which is the one thing that genuinely slows the green coming back in a spot this shaded. Restore it, lock the joints, and protect it; that's the whole job here.