Fertiliser is the most misused product in Australian lawn care — not because people use the wrong bag, but because they use it at the wrong time. A warm-season lawn (buffalo, couch, kikuyu, zoysia — which is to say, your lawn) can only use food while it’s actively growing. Feed it then and you get thickness and colour. Feed it in winter dormancy and most of your money washes through — or worse, feeds the bindii.

The timing that works

Early-to-mid spring, once soil has warmed and the lawn is visibly growing again. This is the main feed of the year. Not on the first warm week of August — wait until you’re mowing regularly again, which is the lawn telling you its engine has restarted. Feeding a still-dormant lawn does nothing for the lawn and plenty for the winter weeds still active in it.

Late summer / early autumn. The second strategic feed, fuelling recovery from summer stress and building the reserves the lawn carries into winter. In the subtropics, where growth runs long, this one matters as much as spring.

Optionally, mid-summer light feeds for lawns under heavy use — kikuyu and short-mown couch, the hungriest setups (why cutting height changes appetite), benefit; a buffalo lawn on the default settings often doesn’t need it.

Winter: put the bag down. The exceptions are marginal (a specifically formulated cool-season application in frost-free coastal areas, if you must) — but the honest default for June–August is none, for the dormancy reasons covered in the by-grass-type guide.

How much and what kind

Amounts are the packaging’s job, not ours — rates differ by product and lawn type, and the bag’s directions are the ones matched to what’s in the bag. The choices that are worth understanding:

• Slow-release granular is the sensible default: steadier colour, less surge growth, far more forgiving of slight over-application.
• Fast-release / soluble gives a quick green-up and equally quick decline, and it’s the type that burns lawns when over-applied or left dry. Treat it as a touch-up tool.
• Buffalo note: buffalo prefers fertilisers without high iron staining risk on paths, and anything labelled “lawn food” suits it — there’s no need for buffalo-specific products, just buffalo-safe herbicides, which is a different aisle and a different article.

The non-negotiable: water it in

Granular fertiliser sitting dry on leaf blades is how lawns get striped with burn. Apply to a dry lawn (so granules fall through to soil), then water thoroughly — same session, not “when it next rains, probably”. If you can’t water it in, don’t apply it that day. This one habit prevents nearly all fertiliser damage, and pairs naturally with a scheduled deep watering.

What fertiliser won’t fix

Feeding is an amplifier, not a cure. It won’t green a lawn that’s brown from dry patch, grubs or dormancy — diagnosis first, food second. It won’t thicken grass that’s dying of shade. And more of it doesn’t mean greener: past the labelled rate you’re buying surge growth, extra mowing, and runoff. Two to four well-timed feeds a year, watered in, on a lawn mowed at the right height — that’s the whole program, and it beats a shed full of products applied at random.

Related: Winter Lawn Care in Australia: Why Your Lawn Goes Brown and What to Skip.