In a shaded, damp garden a moss lawn is soft underfoot, green through winter and drought, and free of mowing, feeding and watering once established. Where grass struggles, it is often the better surface, not the consolation prize.
Is your site right?
Moss lawns want shade or part shade, reliable moisture, and acidic, firm, low-nutrient ground. A spot that bakes in afternoon sun is the wrong place; a cool, damp, north-facing or tree-shaded area is ideal. If grass already sulks there and moss is creeping in on its own, the site is telling you plainly what it wants. Work with that rather than against it, and most of the battle is already won.
Which mosses, and why they carpet
Not every moss makes a lawn. The ones that do are the carpet-formers, the trailing, branching mosses (the pleurocarps) that creep sideways into continuous, walkable cover, rather than the cushion mosses that sit in slow, tight domes. Springy turf-moss and the feather mosses are the usual workhorses, knitting into a sheet far faster than a cushion moss ever would; the split between the two growth habits is explained in acrocarpous and pleurocarpous mosses. It helps to know that a moss has no true roots. It anchors with rhizoids and takes up water across its whole surface, which is why it carpets firm, damp ground so readily and why it never needs feeding.
Prepare the ground
Strip off the existing grass and weeds, level the surface, then firm it down; moss likes close contact with compacted ground, not fluffy tilth. Do not add compost or feed, which only helps weeds and the grass you have just removed. On limey soils a light dressing of something acidic helps tip the balance in moss's favour, since most lawn mosses prefer sour ground.
Plant it
Either press fresh patches of moss firmly onto the prepared surface, butted tight together, or blend moss into a slurry with water or buttermilk and spread it over the area. Carpet-forming species knit into a lawn faster than cushion types, so lean on those. Whichever method you use, firm contact with the soil is what lets the moss grip and spread, so press it down well and go back over any lifted edges.
Establish and keep it
Mist daily for the first three or four weeks, ideally with rainwater, while the moss grips; hard tap water works but leaves a chalky film over time, so rainwater is kinder, as explained in water for moss. After that, rainfall and shade do most of the work. The only routine job is clearing fallen leaves in autumn so the moss is not smothered. Walk on it lightly while it is young; once thick it takes gentle use, and it improves every year.
What to expect, year by year
Temper your expectations on timing and a moss lawn is a delight; expect an instant carpet and you will be disappointed. In the first few months the patches or slurry green up and begin to spread, looking patchy and unconvincing while they do. Across the first full year they knit together into more or less continuous cover. By the second and third years the lawn has thickened into the deep, even, springy surface people picture, and from then on it simply improves. The slow start is the price of a surface that then needs almost nothing; there is more on the pace in how fast does moss grow.
Honest comparison with grass
A moss lawn is not a like-for-like swap for turf, and it helps to know the trade in advance. Against grass it wins on shade tolerance, winter colour, drought resilience and upkeep: no mowing, no feeding, little watering. It loses on hard wear, and will not take football, a running dog or daily heavy footfall the way a sports lawn does, though it copes with normal garden use and stepping stones. So the honest summary is that moss suits a shaded, gently used garden beautifully and a sunny, child-and-ball-battered one poorly. Choose it for the right spot and it outperforms grass; force it into the wrong one and it struggles.