Kikuyu lawn care: the complete year-round guide

Kikuyu is the SUV of lawn grass. It is tough, handles dry weather, and shrugs off kids and dogs. The downside: it grows fast and spreads aggressively. Left alone for a few weeks, it climbs your garden bed and starts strangling your roses. The job of owning a Kikuyu lawn is not making it grow — it is keeping it in line. Here is how to do that, season by season.

What makes Kikuyu different?

Kikuyu (Pennisetum clandestinum) is a warm-season grass from East Africa. It loves heat and sun. In southern hemisphere lawns, that means strong growth from spring through autumn, with a slowdown or full dormancy in winter depending on how cold your region gets.

Compared to Buffalo or Couch, Kikuyu:

• Grows much faster — twice-weekly mowing in peak summer is common
• Spreads aggressively — both above-ground runners and below-ground rhizomes
• Handles wear better — recovers fast from worn patches
• Needs more nitrogen — hungrier than Buffalo or Zoysia
• Builds thick thatch fast — annual scarification is usually needed
• Costs less to install — often the cheapest turf option

The big idea: Kikuyu rewards weekly attention. Miss two weeks of mowing and edging and you will spend a Saturday catching up. Keep up with it and it is one of the easiest lawns to own.

How do I mow Kikuyu properly?

Kikuyu does not like being long. Once it gets past 50mm, the lower leaves yellow from lack of light, and you end up with a thatchy, lumpy lawn. Keep it short and tight.

• Height: 25–40mm, mower setting 2–3 of 7
• Peak summer: twice a week is not too often
• Shoulder seasons: weekly
• Winter: once a fortnight, or not at all if dormant

Never cut more than one-third off in a single mow. If it has got away from you, lower the mower over 2 or 3 mows rather than scalping it. Scalping exposes the runners and looks awful for weeks. A mulching mower works well most of the year — clippings feed nitrogen back into the lawn.

Why is edging so important for Kikuyu?

This is the single biggest care job that owners get wrong. Kikuyu sends out runners that creep over edges, into garden beds, across paths, and up the sides of pots. Within a season, a Kikuyu lawn that has not been edged will swallow a metre of garden bed.

You have two jobs:

1. Vertical edging — cut a sharp line along the lawn edge every 2–3 weeks. Use a half-moon edger or a line trimmer flipped sideways.
2. Stop runners — pull or cut any runner that has crept into a garden bed before it roots. Once a runner sets new roots, it becomes a new patch of lawn.

Mowing the edge does not count. You need a vertical cut to chop the runners. If you only do this once a year, you have already lost the battle.

How much water does Kikuyu need?

Less than you think. Once well-rooted (after about a year), Kikuyu has deep roots and handles dry spells better than most lawns.

• Well-rooted: one or two deep waterings a week in summer. Skip after rain.
• New Kikuyu (first 8 weeks): daily light watering until rooted
• Winter: usually no watering needed — rain handles it

After watering, push a long screwdriver into the soil. If it pushes in easily up to the handle, you have watered enough. Water in the early morning — by 9am. Watering in the evening leaves the leaves wet overnight and invites fungus.

How do I fertilise Kikuyu?

Kikuyu eats more than other lawns. It loves nitrogen. Feed it:

• Early spring (September in AU/NZ) — a balanced lawn fertiliser to wake it up
• Late spring/early summer (November) — nitrogen-heavy feed for peak growth
• Mid-summer (January) — light feed if growth is slowing
• Early autumn (March) — final feed before winter slowdown
• Winter — nothing

Look for a high-nitrogen lawn fertiliser at Bunnings or Mitre 10. Munns Professional Lawn Booster, Scotts Lawn Builder, or Lawn Solutions Exceed are all good picks. Spread with a hand spreader and water it in straight away.

Iron tip: if the lawn is yellowing but growing well, it might just need iron rather than full fertiliser. Try Munns Professional Iron Boost for a colour pop without forcing extra growth.

What about thatch?

Thatch is a layer of dead grass and roots that builds up between the green leaves and the soil. A bit is fine. A lot stops water and air reaching the roots and creates a spongy lawn.

Kikuyu builds thatch faster than almost any other lawn. Scarify once a year in early spring (September) — rake out built-up dead grass with a stiff rake or hired powered scarifier. The lawn looks rough for 2 weeks, then comes back thicker. If your Kikuyu feels spongy or water beads on top instead of soaking in, you are overdue.

Year-round Kikuyu calendar (AU, NZ, ZA)

This is calibrated for southern hemisphere temperate regions — Sydney, Brisbane, Perth, Auckland, Cape Town, Durban. Tropical regions (Far North Queensland, Northland NZ, KZN coast) should treat the whole year more like summer.

What about winter colour?

Kikuyu goes semi-dormant in cooler areas (Melbourne, Canberra, Adelaide hills, southern NSW). It fades to pale yellow-green or brown after frost. This is normal, not dead. In warmer coastal areas (Brisbane, Perth, Sydney coast, Auckland, Durban), Kikuyu stays mostly green year-round.

For winter colour in cooler regions, spread iron (Munns Iron Boost) in late autumn. It boosts colour without forcing growth. Keen owners sometimes overseed with ryegrass in April — the rye dies back as Kikuyu wakes up in spring.

Kikuyu in New Zealand

Kikuyu was once rare in NZ. Warmer summers have changed that. It is now common in Northland, Auckland, the Bay of Plenty, and Hawke's Bay. Care is the same as southern AU. South Island is still too cold — stick with ryegrass or tall fescue.

Frequently asked questions

Is Kikuyu a weed or a lawn?

Both. Many councils class Kikuyu as an environmental weed because of how aggressively it spreads. But it is also one of Australia's most popular warm-season lawns. If you have it deliberately, treat it as a lawn. If a neighbour's Kikuyu is invading, treat it as a weed and edge ruthlessly.

Can I kill Kikuyu in my garden beds without killing my lawn?

Hand-pull or dig is safest. For larger invasions, paint glyphosate (Yates Zero) directly onto runners with a small brush. Do not spray — overspray will kill nearby plants. Usually takes 2 or 3 rounds.

Should I dethatch every year?

Yes for most home Kikuyu lawns. The grass produces thatch so fast that an annual scarify in early spring keeps it healthy. Skip a year and you will pay for it next time.

Can I have a Kikuyu lawn in shade?

Not really. Kikuyu needs at least 5–6 hours of direct sun. In shade it thins out and gets taken over by weeds. If you have heavy shade, pick Sapphire Buffalo or a Zoysia variety instead.

Why does my Kikuyu look yellow in spring?

Often just slow wake-up after winter. Warmer weather plus a feed will green it up. If it stays yellow after warm weather sets in, try Munns Iron Boost first, then a nitrogen feed if that does not fix it.

Let Lawnova handle the calendar

Kikuyu rewards weekly attention but punishes you if you forget. Lawnova sends you the right task at the right time — mow now, edge this week, scarify in two weeks, skip the winter feed. No guesswork.

Sign up here and let your Kikuyu look its best year-round.