Get your Adelaide lawn ready for spring

Most people start thinking about the lawn in October, when it is already patchy, full of summer grass and looking sorry for itself. By then the important decisions have been made for you. The work that decides how a lawn looks in December happens in the back half of winter, right about now.

Here is what actually matters over the next few weeks across Adelaide’s inner north, in rough order of how much difference it makes.

Get the pre-emergent down before the soil warms

This is the big one, and it is the one almost nobody does.

Summer weeds like summer grass, crabgrass and crowsfoot are not in your lawn yet. They are sitting in the soil as seed, waiting. They germinate once the soil temperature climbs past roughly 13 to 14 degrees, which in Adelaide usually means early to mid spring depending on the season.

A pre-emergent herbicide works by putting a chemical barrier in the top layer of soil that stops those seeds establishing. The catch is in the name: it only works before they emerge. Once you can see summer grass in the lawn, a pre-emergent does nothing at all and you are into the much harder job of selective spraying through the heat.

Go by soil temperature rather than the calendar. A cheap soil thermometer pushed 50mm into the ground on a few mornings will tell you more than any date. Get the barrier down while the readings are still sitting below that mid-teens mark and you have removed most of your summer weed problem before it starts.

Finish off the winter weeds before they seed

Bindii and soursobs are still going right now, and both are in the business of setting seed before the warm weather arrives. Every plant you knock down in the next few weeks is one that does not restock the soil for next year.

Bindii is the urgent one, because its seed is the prickle. Deal with it while it is still green and low and you save yourself a November of nobody wanting to walk on the grass barefoot. We have written separately on getting rid of bindii and on why soursobs keep coming back, and both come down to timing more than product choice.

Bring the mowing height down gradually

A lot of lawns sit a bit higher through winter, which is fine. Bringing the height back down in late winter lets light and warmth reach the soil surface, and soil warmth is exactly what triggers green-up.

Do it over two or three cuts, not in one hit. The one-third rule still applies: never take more than a third of the blade in a single pass. Scalping a lawn hard in August exposes bare soil at the precise moment weed seeds are looking for a home, and the grass has no real growth yet to recover with. Lower it a notch, cut again, lower it again.

Hold off on the fertiliser

This is the most common spring mistake we see. The lawn looks tired, so out comes the fertiliser in early August, and the result is a flush of weeds and very little else.

Couch, kikuyu and buffalo are warm-season grasses. They do not properly wake up until the soil warms, which in Adelaide means mid spring rather than late winter. Nitrogen applied to cold soil either washes through or feeds the weeds that are still actively growing while your grass is not. Wait until you can see real growth in the lawn, then feed it. A few weeks of patience turns the same bag of fertiliser into a much better result.

Clear what winter left behind

Leaf litter, twigs after the cold fronts, matted clippings in the corners. A thick layer sitting on the lawn blocks light and holds moisture against the grass, which is how you end up with fungal patches and dead spots showing through just as everything else greens up. Clear it off now so the lawn wakes up evenly rather than in blotches.

Plan the repairs, do not rush them

If winter foot traffic has left you with compacted or bare patches, note them down but resist the urge to fix them yet. Aerating and repairing works best when the grass is actively growing and can knit back together. For couch and kikuyu especially, warmth does most of the work for you. Late winter is for planning, mid spring is for repairing.

The short version

Pre-emergent now. Winter weeds now. Mowing height down slowly, starting now. Fertiliser and repairs later, once the soil has warmed and the lawn is genuinely moving.

Would rather it just happened?

Fair enough. The reason most lawns miss these windows is not laziness, it is that the windows are narrow and life is busy. That is the whole point of a regular service: the pre-emergent goes down at the right soil temperature, the mowing height comes down over the right cuts, and the winter weeds get dealt with before they seed, without you having to track any of it.

We look after homes across Adelaide’s inner north on a reliable fortnightly schedule, mowing, edges, beds and weed control in the one visit.

If you would like your lawn sorted before summer arrives, request a free quote and we will take it from here.