Which lawn grass suits your South African garden: kikuyu, LM, buffalo and more

Most people never choose their lawn. It came with the house, and it either quietly does well or it limps along while you throw water and effort at it every summer. That is a pity, because the grass underfoot is the biggest single plant in most South African gardens and the one that decides your water bill.

There is no best grass, only the right grass for a particular patch of ground. Sun, shade, foot traffic, frost and how much you are prepared to water all point at different answers, and a garden with a shady southern side and a baking western strip usually needs two different grasses rather than one compromise. Here is roughly how we talk it through with customers, starting with the patch instead of the packet.

Start with the patch, not the grass

Spend a Saturday actually watching where the sun lands. Anything getting less than four hours of direct sun is a shade problem, and no amount of fertiliser will turn kikuyu into a shade grass. Then be honest about traffic. A lawn that takes a soccer ball and two dogs every afternoon needs a grass that repairs itself from runners, not one that looks lovely and bruises.

Frost is the third question, and it matters more on the Highveld than people admit. Low lying corners in Centurion and Pretoria East collect cold air and burn off first in May, while a north facing slope two streets away stays green weeks longer. If you know your patch is a frost pocket, choose a grass that goes dormant gracefully rather than one that dies back and leaves you with bare soil.

Kikuyu, the Highveld workhorse

Kikuyu came from the East African highlands and it behaves like it, growing fast, knitting together tightly and repairing damage on its own. It handles children, dogs, cricket in the back garden and general abuse better than anything else commonly sold here. It wants full sun, ideally six hours or more, and it will thin out and go patchy under a tree within two seasons.

The costs are real. Kikuyu wants mowing weekly through a Highveld December, it drinks more than its indigenous alternatives, and it spreads by runners into every flower bed you own. Edging becomes a permanent chore. It also goes straw coloured after the first hard frost and does not properly green up again until the September rains, which some people mind and some people accept as the season doing its thing.

LM grass for the shady side

LM is sold under a few names, including Berea grass and Durban grass, and it is the one to reach for when shade is the deciding factor. It has a broad, soft blade, a lighter green than kikuyu, and it feels genuinely good underfoot. Under a mature tree or along a wall that only sees morning sun, LM will hold on where other warm season lawns give up.

It is not a sports field grass. Heavy traffic bruises it, it recovers slowly, and frost hurts it badly, so gardens on the Highveld that get a proper cold snap should keep LM to sheltered courtyards rather than the open lawn. Mow it high, never scalp it, and accept that it will slow right down and look tired through winter before coming back with the rain.

Buffalo grass on the coast and in dappled light

Buffalo grass has a coarse, broad blade and a habit of forming a dense mat, which makes it forgiving of both salt air and semi shade. It suits KwaZulu-Natal and Cape coastal gardens particularly well, and it needs less mowing than kikuyu because it does not shoot upward with the same enthusiasm. The trade off is thatch. Buffalo builds a spongy layer at the base over a few seasons, and if you never top dress or scarify, water starts running off instead of soaking in.

Cynodon, the indigenous fine one

Cynodon dactylon is the couch grass most South Africans know as kweek, and it grows wild across a huge part of the country. SANBI's plant profile for Cynodon dactylon describes a deep rooted, wiry species that survives drought, grazing and trampling, which is exactly why it ends up on bowling greens and sports fields. The blade is fine, the finish is manicured, and it wears better than almost anything.

It only works in full sun. Put it under a tree and it disappears. It also goes properly dormant and brown in a Highveld winter, and it is aggressive enough to invade beds and paving cracks with real determination. If you want a tight, low, water wise lawn and you have the sun for it, cynodon is hard to beat.

Cool season fescue where nothing else will do

Tall fescue is the outlier here, a cool season grass that stays green right through a Highveld winter while everything else turns to straw. It tolerates more shade than kikuyu, it grows from seed rather than instant lawn, and it gives you a garden that looks alive in July. Illinois Extension's lawn care resources set out how cool season grasses behave through their growing cycle, which is useful background because fescue reverses the local rhythm you are used to.

What it will cost you is summer water. Fescue struggles through the hottest months and needs consistent irrigation exactly when restrictions tend to bite. We usually suggest it for a small, prominent area, a front garden strip you look at every day, rather than for a whole property.

Water, and being straight about it

Warm season grasses like kikuyu, LM, buffalo and cynodon go dormant when water runs short and green up again when it returns, which is a survival strategy rather than a failure. Cool season fescue does not have that option. Either way, the technique that saves the most water is depth. NC State Extension's Carolina Lawns guide makes the case for watering deeply and infrequently so roots chase moisture downward, instead of the daily light sprinkle that keeps roots sitting in the top few centimetres.

If your municipality is on restrictions and you are watching a lawn die anyway, it may be time to shrink it. A smaller patch of grass with a group of planted pots around the edges uses a fraction of the water and looks considered rather than desperate. Our thoughts on building a water wise garden go into the arithmetic of working out what your garden actually needs.

Mowing height and spring top dressing

More lawns are ruined by the mower than by drought. The rule the RHS sets out in its guidance on mowing lawns is to never take off more than about a third of the leaf in one cut, because scalping starves the roots and opens gaps for weeds. Kikuyu is happiest somewhere around 25 to 40 mm, LM wants to be left longer, and cynodon can be taken lower if you cut often. Sharpen the blade too, since a blunt one tears the tips and leaves the whole lawn looking bleached.

Top dressing is a spring job, done once the grass is visibly growing again rather than while it is still dormant. Spread a thin layer of Lawn Dressing, no more than a centimetre or so, and brush it in with the back of a rake so the tips of the grass still show through. It levels the small dips that make mowing uneven, feeds the soil surface and helps a thatchy lawn breathe. Water it in afterwards and leave it alone.

Where lawn stops earning its keep

Some patches will never grow decent grass no matter which bag you buy. Deep shade directly under a big tree, narrow side passages, steep banks and the strip between a driveway and a boundary wall are all fights you lose slowly. Those are the places to stop trying. A bed of White Pebbles with three or four planted pots standing in it needs no mowing, no watering schedule and no apology, and it looks better in a week than the grass looked in a year. Our patio and small garden pots were made for exactly these awkward corners.

Whichever grass you settle on, the soil under it does most of the work, and spring top dressing is the cheapest improvement you can make to a tired lawn. Our soils and pebbles range has the lawn dressing, compost and pebbles to sort out both the lawn and the corners where lawn was never going to work.

Frequently asked questions

Which grass is best for shade in South Africa?

LM grass, also sold as Berea or Durban grass, handles shade better than any other common warm season lawn here. In colder Highveld gardens where frost is a problem, tall fescue is the shade tolerant alternative because it is a cool season grass.

Is kikuyu a good lawn grass?

Kikuyu is excellent for full sun lawns that take heavy use, because it spreads fast and repairs itself. It needs at least six hours of sun, weekly mowing in summer, and constant edging to stop it running into flower beds.

When should I top dress my lawn?

Top dress in spring, once the grass is actively growing again rather than while it is still dormant. Spread a thin layer of lawn dressing, about a centimetre, and brush it in so the grass tips still show through.

How high should I cut my lawn?

Never remove more than about a third of the leaf in a single cut. Kikuyu sits well around 25 to 40 mm, LM grass should be left longer, and cynodon can be cut lower if you mow frequently.

Which lawn grass uses the least water?

Cynodon dactylon, the indigenous kweek or couch grass, is the most drought hardy of the common lawn grasses because it roots deeply and goes dormant rather than dying when water runs short. It does need full sun to do well.