Coastal Mowtown
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Coastal Mowtown lawn tips

How do you get rid of weeds without killing the lawn?

The short answer

The thickest lawn wins. Regular mowing at the right height plus two or three feeds a year crowds most weeds out on its own. For bindii, spray in late autumn or winter while it is still a soft rosette — by the time you can feel the prickles underfoot, it is too late.

Read this first if you have buffalo

Most bindii and broadleaf weedkillers on the shelf are dicamba-based, and dicamba will damage buffalo. It bleaches the leaf yellow, curls it, stops growth, and at the wrong rate it can kill the lawn outright.

Buffalo needs a product specifically labelled as buffalo-safe — typically a bromoxynil and MCPA blend. Check the label for the word buffalo before it goes anywhere near your lawn. Buffalo is the most common home lawn on the Central Coast, so this catches a lot of people out.

The best weedkiller is a thick lawn

Weed seed needs light on bare soil to germinate. A dense lawn does not give it any. Mowing at the right height, feeding a couple of times a year and watering deeply will do more for your weed problem over a season than any bottle will.

If weeds keep coming back in the same place, the real question is why the grass is thin there — shade, compaction, poor drainage or a low spot that stays wet.

Bindii, and why timing is everything

Bindii germinates through autumn and spends winter as a soft, flat, fern-like rosette at ground level. It is easy to walk straight past. Then in late spring the flowers mature into the hard, spiky burrs that end bare feet in the backyard for the summer.

Spraying in late autumn or winter, while it is still soft and actively growing, is the only reliable way to stop it. Spraying once the prickles have formed kills the plant but leaves the burrs exactly where they are.

The other regulars on the Coast

  • Clover — broadleaf, spreads flat, thrives where nitrogen is low. Feeding the lawn properly discourages it.
  • Winter grass (Poa annua) — pale green tufts with white seed heads through the cold months. It is a grass, so broadleaf sprays do nothing. It needs its own product, or hand-pulling before it seeds.
  • Flatweed or catsear — the dandelion look-alike with a deep taproot. Dig it out with the root or it comes straight back.
  • Oxalis — clover-shaped leaves, yellow flowers, grows from tiny bulbs. Persistent, and usually needs several treatments.
  • Nutgrass — bright green, three-sided stems, grows faster than everything around it. Nothing general touches it. It needs a specific nutgrass product, and pulling it makes it worse.

Spraying properly

  • Spray when the weeds are actively growing, not in the middle of a heatwave or a frost.
  • Do not mow for a few days either side. The weed needs leaf area to take the chemical in.
  • Mix at the label rate. Stronger does not mean better, and it is how lawns get burnt.
  • Spot spray where you can rather than blanket spraying the whole yard.
  • Do not spray in wind, and keep pets and kids off until it is dry.

What we handle

Garden tidy-ups and weeding are part of the service — beds weeded, edges redefined and the garden brought back to neat. For lawn chemicals, follow the product label, and if you are unsure what grass you have, ask before you spray.

Would you rather someone else did it?

Keep reading

More lawn tips

All 15 lawn tips

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