Weed control on a rural block, what actually works

March 18, 2025

Getting on top of weeds on a rural block

Weeds are the job that never finishes, and anyone who tells you they have a block with none on it is either not looking or not telling you the truth. What you can do is get far enough in front that you're managing them rather than reacting to them, and that comes down to knowing what you've actually got and then picking the method that suits it, which is a lot less glamorous than the spray ads make it look but it's what works.

Know what you're dealing with first

Not every weed behaves the same way, so the control that flattens one will barely dent another. Around here it's usually one of these 3 groups.

Annuals come up, flower, seed and die inside a year, and capeweed and wild radish are the ones you'll see most.
Perennials come back every season off a root system that is usually bigger than the bit you can see, which is why couch grass and blackberry are such a slog.
Woody weeds turn a paddock into scrub if you leave them, and gorse and African boxthorn are the local examples.

Some weeds carry legal obligations for landholders in South Australia, so it's worth finding out whether any of what you've got falls into that category before you decide what to leave alone, because that changes your priority order rather than just your preference.

Prevention does more than any spray

Getting on top of them before they establish is dull advice and it is still the advice, because a bare patch of soil is an invitation and a thick pasture is not.

Feed the soil. Weeds do best where nothing else wants to grow, so compost, mulch, a bit of rotation and keeping bare dirt covered all make the ground less inviting.
Plant it out. Thick pasture and closely spaced garden beds leave nowhere for a seedling to get going.
Rest your paddocks. Overgrazing thins the grass and thin grass lets weeds in, so rotating stock does weed control for you without you touching a sprayer.

Doing it by hand, which is still the best method on a small patch

For a new outbreak or anywhere you'd rather not spray, the old methods are hard to beat.

Pulling. Best on young weeds before they seed, and get the root out or you've just pruned it.
Slashing and mowing. Won't kill an annual but it stops it flowering, and stopping the seed is most of the battle.
Mulching. A thick layer smothers a lot of species by cutting the light off, and it holds moisture for whatever you do want growing there.

Using a herbicide properly

When an outbreak is past hand pulling, a spray is the efficient answer, and the difference between a good result and a wasted afternoon is nearly always timing rather than product.

Selective herbicides take out broadleaf weeds and leave the grass, which is what you want in a pasture or a lawn.
Non-selective herbicides hit everything they touch, so they belong on driveways and fence lines where you don't want anything at all.
Timing. Spray when the weed is actively growing and it takes the chemical down into the root. Spray a stressed plant in the middle of a dry spell and you'll be back doing it again.

Read the label every time, keep well away from waterways and dams, and don't spray on a windy day, because drift onto a neighbour's vines or your own veggie patch is the sort of mistake that takes a season to undo.

Letting something else do the work

Some weeds have natural enemies, and it's slower than a spray but it keeps working after you've stopped paying attention. Goats and sheep will graze blackberry and thistles that cattle walk past, and some of the woody weeds have introduced insects working on them already.

Mixing the methods is what actually gets you in front

No single method works everywhere on a block, and the people who seem to have it under control are the ones running several at once. Mulch and dense planting around the house, mowing and grazing through the paddocks, spot spraying the outbreaks that are spreading, and a walk around after every decent rain so you catch new ones while they're still small enough to pull.

Shop related products

Brunnings Glyphosphate 360 Weed Killer Concentrate 1L. The non selective one, for fence lines and driveways.
Brunnings Path Weeder Concentrate 1L. Made for hard surfaces where you want a longer gap before it all comes back.
Brunnings Weed Kill For Lawns Spot Spray RTU 1L. Ready to go, selective, and the sensible choice for broadleaf weeds in a lawn.
Martins Organic Sugar Cane Bale 11kg. Mulch, which is the method that works while you're doing something else.

Did you know we also stock knapsack sprayers up to 12 litres, smaller pressure sprayers, stand up steel weeders, mattocks with a cutter end, lucerne mulch and weed mat by the roll in the shop. A fair bit of that isn't on the website, so give us a ring on (08) 8536 4333 to check what's on the shelf.

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