Most lawn weeds in Moreton Bay fall into two groups: broadleaf weeds like bindii, clover and oxalis, and grassy weeds and sedges like summer grass, crowsfoot and nutgrass. They need different treatments, and timing matters as much as the product you use.
Below are the weeds we see most in local lawns, how to spot them, and when to deal with them.
Broadleaf weeds
Broadleaf weeds have wider leaves than grass and are usually the easiest to control with a selective lawn weed killer. The catch is that some selective products damage buffalo lawns, so always check the label says it's safe for your grass type.
| Weed | How to spot it | When to treat |
|---|---|---|
| Bindii (jo-jo) | Low, feathery rosettes that form prickly seeds in spring | Late autumn and winter, before the prickles form |
| Clover | Three-part leaves, white flowers; thrives in thin, hungry lawns | Autumn and spring |
| Creeping oxalis | Small clover-like leaves, yellow flowers, spreading runners | Spring and autumn, often more than once |
| Cudweed | Grey-green rosettes with a woolly look | Autumn and winter |
| Flatweed (cat's ear) | Dandelion-like rosettes with yellow flowers on tall stems | Autumn and spring |
Grassy weeds and sedges
Grassy weeds are harder because they're closely related to your lawn. Most selective broadleaf sprays won't touch them, and they need specific products applied at the right growth stage.
| Weed | How to spot it | When to treat |
|---|---|---|
| Nutgrass (nutsedge) | Shiny, bright green, triangular stems; grows faster than the lawn | Late spring and summer while actively growing, with a follow-up |
| Summer grass | Coarse, spreading grass that fills bare patches in summer | Pre-emergent in early spring; treat young plants early |
| Crowsfoot grass | Flattened clumps with finger-like seed heads | Pre-emergent in spring; treat while young |
| Winter grass | Light green tufts with white seed heads in the cool months | Autumn and winter |
| Paspalum | Coarse clumps with sticky seed heads, common on verges | Spring and summer; dig out small clumps |
Weeds to take seriously
Some weeds that turn up at the edges of lawns and gardens are listed as restricted invasive plants in Queensland, including Singapore daisy and lantana. They spread aggressively into gardens and bushland, and landholders are expected to control them. Singapore daisy in particular can creep into lawns from garden edges and is hard to get rid of once established. Persistent treatment and removal is the only way to deal with it.
Why weeds keep coming back
- Seeds already in the soil keep germinating for years
- Thin, patchy lawns leave room for weeds to grow
- Mowing too low weakens the grass and lets light reach weed seeds
- Compacted soil favours weeds like bindii and clover over grass
- Poor nutrition gives clover a head start, since it can make its own nitrogen
- Weed seeds arrive with imported soil, turf and mulch
That's why spraying alone rarely fixes a weed problem. The long-term fix is a thick, healthy lawn: mowing at the right height, feeding in spring and autumn, and fixing compaction with aeration. See lawn restoration.
Safe use around the home
Whatever you use, read and follow the label: the right grass types, the rate, the weather conditions and how long to keep kids and pets off. Don't spray before heavy rain, on windy days or near drains and waterways. Stormwater drains in Moreton Bay flow straight to creeks and rivers.
Questions we get asked
Can I just pull weeds out by hand?
For a few broadleaf weeds, yes, as long as you get the root. Nutgrass is the exception. Pulling it usually leaves the underground nuts behind, and they regrow.
Why did my buffalo lawn go brown after I sprayed weeds?
Some lawn weed killers damage buffalo. Always check the label says it's safe for buffalo, or have someone apply a product that is.
Weeds winning?
We treat lawn and garden weeds with grass-safe products and ongoing programs timed to the seasons.
- Weed Control: Targeted weed control for lawns, garden beds, driveways, fence lines and large sites, with the right method for each area.
- Lawn Restoration: Bring tired, patchy or weedy lawns back with scarifying, aeration, top dressing, fertilising and patch repairs.
- Lawn Mowing: Regular mowing, edging and whipper-snipping for homes and rentals, on a weekly, fortnightly or monthly schedule.