Starting a New Lawn: Seed or Turf?

A new lawn is one of the few garden jobs where you go from bare soil to a closed green surface in a matter of weeks. And one of the few that reflects every early mistake back at you for years: where the soil was compacted, water later stands; where the seed lay unevenly, it grows patchy. A lawn forgives a lot if you give it a good start. That is exactly why it pays to pause before the first handful of seed and settle two questions: seed or turf? And when?

Seed or turf: the honest trade-off

Both roads lead to the same place; they differ mainly in money, time and nerves. Seeding means: you buy a bag of seed, spread it and wait. Turf means: you order a finished sward from a turf farm, it arrives on pallets, and the same day a green carpet lies in your garden.

Turf usually consists mostly of smooth meadow-grass (Poa pratensis), often blended with perennial ryegrass (Lolium perenne). These species form dense swards and tolerate foot traffic. With seeding you get free choice of the blend and can tailor it to your site: for the shade under trees, red fescue (Festuca rubra) belongs in the mix; for the play lawn, a high ryegrass share.

The right timing: lawn season comes twice a year

Grass germinates and roots best when the soil is evenly warm and moist. In our latitudes that applies to two windows.

The spring window falls in CW 16 to 20, roughly mid-April to mid-May. The soil has warmed to the necessary 8 to 10 degrees, and the seedlings have the whole summer to grow strong. In spring, wait until the soil has dried out and turned crumbly; on wet, cold earth seed rots rather than germinates.

The late-summer window in CW 33 to 37, roughly mid-August to mid-September, is the better one for many professionals. The soil is still warm from summer, the nights turn moister, and the worst summer weeds have already spent their strength. A lawn sown in September goes into winter vigorous and stands denser in spring than any spring sowing.

Avoid the high-summer months of July and early August for seeding: the germinating surface then dries out so fast that you would have to water twice a day. Turf can be laid in summer too, but only with intensive watering.

Soil preparation decides everything

This is where the lawn is made, not at the sowing. Take your time over this part; fixing it later takes real effort. The following steps apply to seeding and turf almost identically.

1. Clear the area and remove old turf

   Thoroughly remove stones, roots, rubble and old lawn. On an old, mossy surface a rental tool pays off: a turf cutter lifts the old sward cleanly. You must pick out root weeds like couch grass or ground elder completely, or they will push back up through the new lawn.

2. Loosen and dig over the soil

   Dig the soil over a spade deep or run a tiller through it, especially on compacted areas. Good loosening down to 20 to 30 cm lets the roots breathe later and lets water drain away. On heavy clay work in coarse sand; on light sandy soil, mature compost.

3. Level and grade

   Rake the surface smooth and work toward a slight fall away from the house. Fill in hollows where water would otherwise collect. Use a long batten or a string line to help: what is a dip now becomes a puddle and a bare patch later.

4. Let it settle and firm it

   Let the graded surface rest for one to two weeks so the loose soil settles. Then roll it lightly or tread it firm with boards under your feet. A load-bearing but not rock-hard base is the goal. Rake the surface back to a fine crumb at the end.

A soil test pays off if you want to know for sure. Grass likes a pH of 5.5 to 6.5. If the soil is more acidic, a starting dose of lime helps; do that best two to three weeks before sowing, not at the same time as the fertiliser.

Sowing the lawn: step by step

Once the soil is prepared, sowing is quickly done. Pick a windless day so the fine seeds do not blow away.

1. Measure out the seed

   Reckon on 20 to 30 grams of seed per square metre. Weigh out the amount for your area and split it into two halves. Buy a quality blend with an RSM label (the German standard seed-mixture mark); cheap DIY-store seed often contains forage grasses that germinate fast but stay coarse and gappy.

2. Spread in two passes

   Spread the first half in lengthwise passes, the second crosswise. That evens out the inevitable gaps and gives you consistent density. A spreader does this more precisely than the hand; for small areas a practised wrist is enough.

3. Rake in and press down

   Rake the seed in only very shallowly, at most 0.5 to 1 cm deep. Grass seed needs light to germinate and must not be buried. Then roll the surface or press it with a board so the seeds have soil contact.

4. Water and keep moist

   Water the surface finely and thoroughly. From now on the iron rule applies: the top few centimetres must never dry out until germination. In dry weather that means brief watering twice to three times a day, better often and little than seldom and a lot.

After 7 to 20 days you will see the first green haze. Do not be fooled: that is not yet a lawn but a delicate seedling. Step on the surface as little as possible in the first weeks.

Laying turf: green in an afternoon

Turf demands the same soil preparation but shortens everything after it. Important: order it only once your soil is ready, because it must be laid on delivery day. Left rolled on the pallet, it starts to yellow after a day or two.

1. Prepare the soil and fertilise lightly

   The base is raked to a fine crumb and lightly pressed, just as for seeding. A starter feed with a phosphate-rich lawn starter gives the roots a boost. Dampen the soil lightly before laying.

2. Lay the strips offset

   Start along a straight edge and lay the first strip taut. Butt the next strip close, but offset the cross joints like brickwork so no continuous seams form. Do not step on freshly laid strips; work from a board that spreads your weight.

3. Trim and press down

   At edges and around beds, cut the sward to fit with a sharp spade or knife. Finally roll the whole surface so the sward gets full soil contact and no air pockets remain.

4. Water thoroughly

   Right after laying, water heavily until the soil beneath the sward is soaked through, about 15 litres per square metre. Water daily for the first two weeks and keep off the surface.

What does it really cost?

The bare material price tells only half the story. Factor in tools, soil amendments and your time.

The first weeks: how a seedling becomes a lawn

The first cut is an important moment. Wait until the blades stand 8 to 10 cm tall, then trim only the top third to about 5 cm. A sharp blade on the mower is now essential; a blunt one tears the still shallow-rooted seedlings out of the soil. With turf you mow for the first time after about two weeks, once the sward is firmly rooted and can no longer be lifted.

Keep the surface weed-free in the first weeks simply by regularly topping off any emerging weeds with the mowing. Most annual weeds vanish on their own once the lawn closes up densely and takes their light. If bare patches remain after a few weeks, that is normal; how to close them deliberately is shown in the article Overseeding bare patches in the lawn.

Give the young lawn its first season to settle. Only in the second year does the freshly laid surface become the dense, load-bearing lawn that children can play on and garden chairs can stand on. That is not a setback but the normal path. The garden thinks in years, not weeks.

Häufige Fragen

Seed or turf: which is better for the home garden?

It depends on budget and patience. Seeding is markedly cheaper (around 1 to 3 euros per square metre of seed) and lets you match the grass blend exactly to your site, but needs eight to twelve weeks until the surface takes weight. Turf costs 8 to 15 euros per square metre installed, but looks finished on laying day and is walkable after two to three weeks. For small to medium areas with a little time, seeding is usually the more economical choice; for slopes, showpiece areas or when it has to be quick, turf is worth it.

When is the best time to start a new lawn?

There are two good windows a year. The spring window falls in CW 16 to 20 (mid-April to mid-May), once the soil has warmed to 8 to 10 degrees. The late-summer window in CW 33 to 37 (mid-August to mid-September) is often even better, because the soil is still warm, the nights turn moister and the summer weeds ease off. Avoid high summer in July, because the germinating surface then dries out too fast.

How much grass seed do I need per square metre?

For a new lawn, reckon on 20 to 30 grams of seed per square metre. For 100 square metres you therefore need 2 to 3 kilograms. Spread the amount best in two crossed passes, one half lengthwise, the other crosswise, so the density becomes even. When overseeding bare patches, half the amount is enough, so about 10 to 15 grams per square metre.

How long does it take for a new lawn to germinate and be walkable?

You will see the first green blades after 7 to 20 days, depending on grass type and soil temperature. But it takes eight to twelve weeks before the lawn is truly firm underfoot and load-bearing. Turf is much faster: it is green on laying day and walkable after two to three weeks, once the sward has rooted in firmly and can no longer be lifted.

Do I really have to water a new lawn every day?

During the germination and establishment phase, yes. Freshly sown lawn and newly laid turf must not dry out in the first two to three weeks. In dry, warm weather that means brief, fine watering twice to three times a day, better frequent and little than seldom and a lot. Once the lawn has grown in, you switch to infrequent but thorough watering; that encourages deep roots and makes the lawn drought-resistant.