Why Slopes Need a Different Approach
Laying turf on a slope follows most of the same principles as laying turf on flat ground, but gravity adds a couple of challenges. Rolls can slide before they root, water runs off instead of soaking in, and loose soil is harder to firm properly.
The good news is that moderate slopes are perfectly fine for turf. Most garden slopes fall well within the range where turf will establish without trouble, as long as you follow a few extra steps.
Assessing Your Slope
Most garden slopes are gentle enough for standard turf laying with pegs. As a rough guide, if you can walk up the slope comfortably without using your hands, turf will be fine.
Steeper slopes — roughly steeper than 1 in 3 (where the ground rises 1 metre for every 3 metres of horizontal distance) — are more challenging. At this gradient, you may need erosion-control netting beneath or over the turf to hold everything in place. Very steep banks may be better suited to ground-cover planting rather than turf.
Ground Preparation on a Slope
The preparation steps are the same as for flat ground: clear the area, break up the top 150mm of soil, and apply a pre-turf fertiliser. The difference is that firming becomes more important.
Firming the Surface
On flat ground, a light shuffle across the soil is usually enough. On a slope, take extra care to firm the surface thoroughly. Loose soil beneath turf on a slope can wash out during heavy rain, leaving hollows and causing rolls to sag.
Use the back of a rake or a roller to consolidate the soil. Work across the slope (horizontally), not up and down, to avoid creating channels for water to run through.
Levelling
You won't get a perfectly flat surface on a slope — that's fine. Focus on removing bumps and filling dips so the turf makes good contact with the soil across the full width of each roll. Poor contact means slow rooting, and slow rooting on a slope means rolls that shift.
Laying the Turf
Start at the Bottom
Begin laying from the base of the slope and work your way up. Each new row sits slightly above and behind the previous one, so the weight of the upper rows helps hold the lower ones in place.
Lay Rolls Horizontally
This is the most important rule for slopes. Lay each roll across the slope, perpendicular to the direction of the gradient. If you lay rolls running up and down the slope, water will channel between them and wash out the soil beneath. Horizontal rolls also resist sliding far better.
Stagger the joints between rows, just as you would on flat ground — like brickwork. This prevents a continuous seam running down the slope where water can penetrate.
Peg the Rolls
On flat ground, turf stays put under its own weight. On a slope, it needs help. Use biodegradable wooden pegs (sometimes called turf stakes) to pin each roll in place. Push them through the turf and into the soil beneath at roughly 500mm intervals.
You can buy purpose-made turf pegs, or make your own from short lengths of wooden dowel sharpened at one end. They'll rot away naturally once the turf has rooted — typically within a few months.
For steeper slopes, consider using biodegradable erosion-control netting pegged over the top of the turf. This holds everything firmly while roots establish.
Watering Turf on a Slope
This is where slopes catch people out. Water runs downhill, which means the top of your slope dries out faster than the bottom. A single long watering session will mostly benefit the base of the slope while the top stays dry.
The solution is to water little and often. Short sessions of a few minutes allow water to soak into the turf before it runs off. Repeat several times a day during the first couple of weeks, especially in warm weather.
A sprinkler set on a timer works well. If you're watering by hand, start at the top of the slope and work down. Check the top section regularly — if the turf feels light or the edges are curling, it needs more water.
For more detail on watering schedules, see our watering new turf guide.
Aftercare
Keep all traffic off the slope for at least 3–4 weeks. This is even more important than on flat ground — footsteps can dislodge rolls that haven't yet rooted.
Once the turf has rooted and you're ready to mow, always mow across the slope rather than up and down. This is safer for you and reduces the risk of wheel marks channelling water.
If you notice any rolls that have shifted or gaps forming, press them back into place, re-peg if needed, and fill any gaps with fine topsoil. See our guide on fixing gaps in turf for more detail.
Quick Checklist
- Firm the soil thoroughly before laying
- Start at the bottom, work upwards
- Lay rolls horizontally across the slope
- Peg every roll with biodegradable stakes
- Water little and often — short frequent sessions
- Stay off the slope for 3–4 weeks minimum
- Mow across the slope, not up and down