The ground is the job. The turf is the easy afternoon.
Almost everybody plans this backwards. Laying turf on prepared ground is pleasant work and a 50 square metre lawn goes down in a few hours. The preparation underneath it is a day or two of genuinely hard graft, and it is the whole of the difference between a lawn that thrives and one that goes patchy by midsummer.
The failure mode is specific and worth recognising, because it is delayed. Turf laid on poor ground looks perfect for about six weeks. It is living off what it arrived with. Then the roots reach the compacted layer, find nothing, and the lawn thins out, goes yellow in patches and never quite recovers. By then it looks like a watering problem and it was a preparation problem.
Killing what is there, and why digging it in makes it worse
Old grass and weeds have to go before anything else happens. The instinct is to rotavate the lot and turn it in, and for annual weeds that is fine.
For perennials it is the worst thing you can do. Couch grass, bindweed, ground elder and dock all regrow from root fragments, so a rotavator meets one root system, cuts it into two hundred pieces, and distributes them evenly through your new topsoil. You have not removed the weed, you have planted it properly. Those come up through the new lawn within a season and there is no fixing it afterwards without lifting the turf.
So the order is: deal with perennial weeds first and completely, either by digging the roots out or by treating and waiting the full period, and only then break the ground up.
Levelling, and the heel-and-rake almost everybody skips
Once the ground is broken up and the topsoil is in, it is soft, and soft ground is not finished ground. Freshly dug soil is full of air, and over the following months that air comes out under the weight of the lawn and the rain. Wherever it was deepest, the surface drops.
Which is why the sequence is rake, heel, rake again, twice over:
- Rake it level. Working the high spots into the low ones, checking by eye from the far end where dips are much easier to see.
- Heel it down. Shuffling across the whole area on your heels, which sounds ridiculous and is the most effective thing available. Boots concentrate your weight enough to find every soft spot, and a roller does not.
- Rake again. Heeling leaves the surface uneven, so the second rake is what makes it flat and firm at the same time.
- Then do both once more. The second pass finds what the first one compressed into view.
Firm and level beats deep and fluffy every time. The dips you leave here are the dips you will be looking at, and mowing over, for the next twenty years.
Laying: a straight edge, a brick bond, and no stretching
Start against something straight and permanent, usually a path, a patio edge or a fence line, and work away from it. Starting in the middle guarantees the error accumulates somewhere visible.
Stagger the joints row against row so nothing runs straight through. Butt the edges up firmly and do not pull it to close a gap: turf stretches while it is wet and contracts as it dries, so every joint you tightened opens wider than the one you were trying to fix. Where you are short, cut a filler piece.
Work off a board or a plank laid on what you have just finished, so you are never standing directly on new turf. Footprints in soft ground under fresh turf set as permanent dips.
Watering is where new lawns actually die
For roughly three weeks this is the only thing that matters, and the common mistake is the opposite of neglect: frequent light watering.
A sprinkle wets the grass and the top of the turf and stops there. The roots have no reason to go down looking for water because there is water where they already are, so they stay in the turf layer, and you end up with a lawn sitting on the soil instead of growing into it. The first hot week kills it.
What you want is fewer, heavier soaks that push water through the turf and into the soil underneath, pulling the roots down after them. Check by lifting a corner: if the soil below is dry while the turf is wet, you have not watered enough however long you stood there.
The first cut
Wait until it is anchored, which is the corner test again: gentle pull, and it should resist. Two to three weeks in growing weather, longer in cold soil.
Then cut it high. Mower on its top setting, taking the tips off and no more, for the first two or three cuts, dropping the height gradually after that. A new lawn is building a root system and it builds it with leaf, so scalping it in week three takes away the thing doing the work. Sharp blades matter more than usual too, because a blunt mower tears grass that is not yet firmly held and pulls pieces out.
For quantities before any of this starts, the turf calculator covers how much to order, the wastage allowance and the delivery deadline that decides which day you can start, and the topsoil calculator works out the soil underneath, which on most lawns costs more than the grass does.
Common questions
How long does turf take to root?
Two to three weeks in growing weather, and you can check rather than guess. Lift a corner after seven days and pull gently: if it resists and you can see pale new roots reaching into the soil beneath, it has started. If it lifts like a carpet with nothing holding it, it has not, and the usual reason is that it dried out at the interface between turf and soil. Cold soil slows everything down, so turf laid in November may sit doing very little until March and still be perfectly alive.
Can I lay turf straight onto my existing lawn or soil?
Onto existing lawn, no, never. The old grass dies under the new turf and rots, which leaves a soft spongy layer that stops the roots reaching real soil and holds water against them. Onto existing soil, yes, if it is genuinely soil and it has been broken up and levelled. What does not work is laying onto compacted clay, subsoil or builders rubble, and that failure has a signature: the lawn looks perfect for about six weeks, then goes thin and patchy as the roots hit the pan and stop.
What happens if I stretch the turf to close a gap?
It opens a bigger gap a fortnight later. Turf is held together by roots and soil and it will stretch a surprising amount while it is wet and freshly cut, then it contracts as it dries and settles. Every joint you pulled tight becomes a visible line, and because you did it everywhere the whole lawn ends up gapping at once. Butt the pieces up firmly and cut a filler piece where you are short.
When is the best time of year to lay it?
It depends which kind of grass you are laying, and this is where instructions from another country will send you wrong. Cool-season grasses, which is nearly everything in Britain, Ireland, Canada and the northern United States, do best laid in autumn: warm soil, reliable rain and months to establish. Warm-season grasses such as couch, kikuyu and buffalo, which dominate in Australia and the southern United States, want late spring into early summer and will sulk if laid into cool soil. Same job, opposite calendar.
How much should I water it, and for how long?
More per session and less often than instinct suggests, for about three weeks. The target is water reaching through the turf and into the soil below, which means a proper soak rather than a passing sprinkle. A light daily misting is actively counterproductive: it keeps the turf layer damp and gives the roots no reason to go down looking for anything, so you get a shallow-rooted lawn that collapses in the first dry spell. Check by lifting a corner and feeling whether the soil underneath is wet or just the turf.
When can I mow it, and how short?
Once it is rooted, which is when it resists a gentle pull, and then high. Set the mower to its top setting for the first two or three cuts and take the tips off rather than cutting it properly. Mowing too early tears turf that is not anchored yet, and mowing too short removes the leaf area the grass is using to build its root system, which is the opposite of what you want in the first month. Drop the height gradually over several cuts.