The complete buffalo grass (Sir Walter) care guide for Australia

Buffalo grass, including the popular Sir Walter variety, wants to be mown to 30–50mm, watered deeply once or twice a week in the warmer months rather than little and often, and fed with a slow-release lawn fertiliser about three times a year. It's the most shade-tolerant lawn type sold in Australia and holds its colour through winter better than couch or kikuyu, but it's also more sensitive to the wrong herbicide and prone to a couple of problems those other grasses don't get. This guide covers all of it, season by season.

What is buffalo grass, and what makes Sir Walter different?

"Buffalo grass" (botanically Stenotaphrum secundatum) is a broad-leafed, soft, warm-season turf grass and one of the three most common lawns in Australia, alongside couch and kikuyu. Sir Walter is not the species itself but a specific proprietary cultivar — bred and sold under licence through the Lawn Solutions Australia network, and now sold as "Sir Walter DNA Certified" to guarantee buyers are getting genuine stock rather than a look-alike sold under the same name. Other common buffalo cultivars you'll see at Australian turf farms include Sapphire, Palmetto and ShadeMaster, each bred with slightly different strengths — Sapphire for shade and fine leaf, Sir Walter for drought tolerance and winter colour retention, Palmetto for a softer leaf underfoot.

Whichever cultivar is in your yard, the day-to-day care is very similar, so this guide applies to all of them unless we say otherwise.

Mowing height and frequency

Buffalo is not a lawn you scalp. Cutting it too short exposes the runners (stolons), stresses the plant and opens bare patches to weed invasion — the opposite of couch or kikuyu, which tolerate a much lower cut.

Season	Mowing height	Typical frequency
Spring & summer (peak growth)	35 – 50mm	Every 7 – 10 days
Autumn	35 – 50mm	Every 2 – 3 weeks
Winter (dormant/slow)	Toward the higher end, ~45 – 50mm	Roughly monthly, as needed
New turf, first mow	~50mm, once the turf reaches 60 – 70mm tall	—

Follow the one-third rule regardless of season: never remove more than a third of the leaf blade in a single cut. If the lawn has gotten away from you, bring it down gradually over two or three mows rather than scalping it back in one go. Keep mower blades sharp — a clean cut heals fast, while a ragged, torn cut is an easy entry point for disease. If you'd rather have this handled on a set schedule at the right height for your grass type, that's exactly what our regular lawn mowing service covers.

Watering buffalo grass

Buffalo does best with deep, infrequent watering rather than a quick sprinkle every evening. In the warmer months, one to two deep waterings a week is usually enough for an established lawn — enough to wet the soil to around 10–12cm — followed by letting the surface dry out before the next watering. That encourages roots to grow down rather than staying shallow near the surface, which makes the lawn more drought-resilient overall. In very hot or dry stretches, that can stretch to two or three sessions a week including one deep soak. Through a normal Victorian autumn and winter, rainfall usually covers it and supplemental watering can drop right off; shaded areas need less water again than open, sunny parts of the same lawn.

Fertilising buffalo grass

Buffalo lawns generally do well on three feeds a year using a slow-release granular fertiliser formulated for buffalo, applied at around 20–25g per square metre (2–2.5kg per 100m²) — check the bag, as rates vary by product. A sensible spread for southern Australia is an application in early spring (September–October) as growth picks up, a second in early summer, and a third in early-to-mid autumn (March–April) before growth slows for winter. Ease off nitrogen through winter dormancy, since pushing growth when the plant can't use it does more harm than good.

Buffalo-specific blends are widely available — as of mid-2026, a bag of buffalo-labelled slow-release fertiliser from a produce store or Bunnings typically runs from around $35 for a small bag up to around $100 for a large 15kg bag, depending on brand and size. Buffalo-specific formulas matter here: buffalo needs a different nitrogen-to-iron balance than couch or kikuyu blends, and using the right product helps avoid some of the yellowing issues covered below.

How much shade can buffalo grass handle?

This is buffalo's standout strength over couch and kikuyu, which both want full sun to perform. Most buffalo cultivars need a minimum of three to four hours of direct sunlight a day to stay healthy. Sir Walter copes reasonably well down toward that lower limit, while Sapphire buffalo is bred specifically for shade and can hold up in dappled light approaching 70–80% shade. Past that point, no buffalo variety will thrive long-term — you'll see it thin out, and moss or bare dirt will start creeping in under dense tree canopy regardless of which cultivar you've got.

Common buffalo grass problems

Buffalo Grass Yellowing

A patchy, general yellowing that comes and goes with the seasons has been documented on turf farms across Australia and is genuinely not well understood — researchers have linked it to soil pH and nutrient issues, lime-induced chlorosis in some soils, root fungi, and viruses (Sugarcane Mosaic Virus and related strains, all present in Australia). It generally doesn't respond to fungicide. Growers have had more luck with lighter, more frequent nitrogen applications than one heavy feed — worth trying before assuming the worst.

Grey leaf spot

Straw-coloured, blotchy patches on the leaf blade, usually worse in warm, humid weather and made more likely by too much nitrogen. Cutting back on fertiliser, watering in the morning rather than the evening (so leaves dry out during the day) and improving airflow around shaded, damp areas all help. If it's severe, ask your produce store or Bunnings for a fungicide registered for grey leaf spot on turf and follow the label exactly.

Armyworm and sod webworm

Both are caterpillars that show up in late summer and autumn and chew leaf blades, sometimes stripping a lawn back fast if left unchecked. Armyworm moves in groups and can feed day and night in a bad outbreak; sod webworm builds small silk tunnels in the thatch and feeds at night, leaving more scattered damage. Products containing chlorantraniliprole (sold as Acelepryn) give curative control plus months of protection and are labelled safe for buffalo, couch, kikuyu and zoysia; bifenthrin-based products are a common active-outbreak treatment. Always check the label matches your grass type and follow the application rate exactly.

Curl grubs are a separate, root-feeding pest that shows up as spongy turf lifting away like carpet — different symptoms, different treatment, and worth its own investigation if you spot that pattern rather than leaf damage.

Weed control in buffalo lawns

Soft-leaf buffalo varieties, Sir Walter included, are noticeably more sensitive to herbicides than couch or kikuyu, and a broadleaf weed spray labelled safe for those grasses can seriously damage or kill patches of buffalo. Always check the label specifically says "safe on buffalo" before spraying. The long-time standard for bindii, clover and oxalis in buffalo lawns, Bin-Die, is now largely unavailable; products built on the same active ingredients — bromoxynil and MCPA — are the modern equivalent and are labelled safe for buffalo when used as directed.

Glyphosate (Roundup and similar) is non-selective and will kill buffalo along with whatever it lands on, so it has no place as a general weed treatment within an existing lawn — it's only useful for killing off grass completely before re-turfing or edging a garden bed. If hand-weeding a small outbreak isn't keeping up, our weeding service can treat it as part of a regular visit using products matched to your grass type.

Buffalo grass care calendar

Season	What to do
Spring (Sep – Nov)	Mowing ramps up to weekly; first fertiliser feed; treat bindii and clover before they seed; watch for new weed germination as soil warms.
Summer (Dec – Feb)	Peak growth — weekly mowing; deep water 1–2x a week in dry spells; second fertiliser feed; watch for armyworm and sod webworm activity late in the season.
Autumn (Mar – May)	Mowing slows to every 2–3 weeks; third fertiliser feed early in the season; good window for weed control before winter dormancy.
Winter (Jun – Aug)	Mow only as needed, roughly monthly, at the higher end of the height range; cut back watering and nitrogen; expect some colour loss but not dieback.

If you're weighing up buffalo against couch or kikuyu for a new lawn, the short version is that couch and kikuyu handle more foot traffic and full sun better, while buffalo wins on shade tolerance, winter colour and a softer feel underfoot — worth its own deeper comparison, which we'll cover in a future guide. In the meantime, if you already know your lawn is a buffalo variety and just want it mowed properly and on schedule, see what's included in a standard visit on our lawn mowing cost guide.

Frequently asked questions

What height should I mow buffalo grass?

Between 30mm and 50mm, with 35–45mm suiting most lawns. Never take off more than a third of the leaf blade at once, and avoid scalping it down to 20mm or lower.

Why is my buffalo lawn turning yellow?

It may be Buffalo Grass Yellowing, a recognised but poorly understood condition linked to soil pH, nutrients, root fungi and viruses, which doesn't respond to fungicide but can improve with lighter, more frequent nitrogen. Rule out grey leaf spot, grub damage or dog urine spots first if the yellowing is sudden or patchy rather than general.

Can I use Roundup (glyphosate) on a buffalo lawn?

Not within the lawn — it's non-selective and will kill the buffalo along with the weed. It's fine for killing grass completely before re-turfing, but use a selective herbicide labelled safe for buffalo for weeds within an existing lawn.

How much water does buffalo grass need?

One to two deep waterings a week in warm months, reaching 10–12cm into the soil, then letting the surface dry before watering again. Cooler months and shaded areas need noticeably less.

Will buffalo grass grow in full shade?

Not full shade, but it copes with more shade than any other common Australian lawn type. Most varieties need at least 3–4 hours of direct sun; Sapphire buffalo is the most shade-tolerant and can handle dappled light up to around 70–80% shade.