A lawn weed is any plant you didn’t plant. Most common lawn weeds in Australia fall into three groups: grassy weeds, broadleaf weeds, and sedges, and each group needs a different weed control plan.
If your yard is patchy, prickly underfoot, or dotted with yellow flowers and seed heads, you’re not alone.
Heavy rain, shade, foot traffic, and thin turf all open the door to weed seeds blowing in from neighbouring garden beds and gardens. Right?
Here’s the plan ALC’s crew follows on real Brisbane lawns:
- Identify the weed type (grassy, broadleaf, or sedge).
- Match the right ALC product to your grass. Pre-emergent herbicide to stop weed seeds, or post-emergent herbicide to kill what’s already up.
- Thicken the entire lawn with healthy ALC turf and proper feeding so weeds can’t come back.
A thick, healthy, well-fed lawn is the best defence against weed infestation.
Grassy, Broadleaf, or Sedge: How to Tell in 30 Seconds
Weeds are generally grouped into broadleaf, grassy, or sedge groups, and identifying the group is critical for the right management plan.
- Grassy weeds resemble lawn grass with narrow, blade-like leaves and parallel veins. Think winter grass, summer grass, and crabgrass.
- Broadleaf weeds have wider, net-veined leaves and often show small flowers or bright yellow flowers. Bindii, clover, dandelion, and creeping oxalis live here.
- Sedges look like grass but have triangular, solid stems. Nutgrass and Mullumbimby Couch are the two you’ll meet in South East Queensland (SEQ).
A quick field test: roll a stem between your fingers. Round and hollow = grass. Flat with net veins = broadleaf. Three-sided and solid = sedge.
Common Lawn Weeds in Australia to Check Out
Before we get into sprays, here are the weeds ALC’s team most commonly sees across South East Queensland homes, civil sites, and reseller yards.
| Weed | Type | Quick ID |
| Winter Grass (Poa annua) | Grassy weed | Low-growing turf grass with soft, drooping green leaves and triangular seed heads, common in winter months |
| Summer Grass | Grassy weed | Red or brown stems, thin grey-green leaves, fine spiky seed heads in summer |
| Crabgrass | Grassy weed | Wide blade, finger-like seed heads at the tips of long stems |
| Crowsfoot Grass | Grassy weed | Tufted stems to 30 to 60 cm, seed heads with 2 to 10 radiating spikes in a crowsfoot pattern |
| Paspalum | Grassy weed | Tall tufts to 1.5 m if left uncut. In mowed lawns it shows as a stubborn coarse tussock with sticky seeds, late spring to autumn |
| Bindii (Soliva sessilis / Jo-Jo) | Broadleaf weed | Low-growing weed with green carrot-like leaves and a central flower, leaving sharp spines in summer |
| Clover (Trifolium) / White Clover | Broadleaf weed | Oval-shaped clover-like leaves with a white circular marking. Flowers can be white, pink, red, or yellow, often white flowers with white petals |
| Creeping Oxalis (Oxalis corniculata) | Broadleaf weed | Invasive weed that creeps along the soil, rooting where a stem touches. Small yellow flowers and explosive seed pods |
| Oxalis | Broadleaf weed | Clover-like leaves, tiny yellow flowers, fleshy taproot |
| Dandelion (Taraxacum) | Broadleaf weed | Bright yellow flowers, deeply notched hairy leaves, rosette growth, puffball of dandelion seeds on a long taproot |
| Catsear (“false dandelion”) | Broadleaf weed | Hairy leaves, bright yellow flowers on tall stems |
| Cudweed | Broadleaf weed | Grey-woolly rosette, mid spring flowering |
| Plantain / Lambs Tongue | Broadleaf weed | Ribbed oval green leaves, upright seed spike |
| Black Medic | Broadleaf weed | Small yellow flowers, trefoil leaves, creeping habit |
| Black Nightshade | Broadleaf weed | Dark green leaves, small white flowers, black berries. Remove with gloves |
| Onion Grass / Onion Weed | Bulb weed | Slender leaves, small flowers on long stems, small bulbs underground. Pre emergents and most selectives don’t work; needs spot glyphosate or careful bulb removal |
| Carrot Weed | Broadleaf weed | Fern-like foliage resembling carrot tops, often appears early summer |
| Nutgrass (Cyperus rotundus) | Sedge | Noxious sedge weed with triangular stems and lighter green leaves that grow taller than surrounding grass, producing nut-like tubers (brownish-red) |
| Mullumbimby Couch (Cyperus brevifolius) | Sedge | Triangular stems, short rhizomes, fibrous roots, mat-forming, loves wet ground |
Not common in SEQ lawns: Ground ivy, Canada thistle, and poison ivy are mostly overseas lawn problems. If you think you’ve spotted one in your yard, send ALC a photo before spraying anything.
Herbicide matrix and what ALC products can do
Matching the product to your grass is where most homeowners go wrong, so here’s the cheat sheet. Always read the label, every product, every time.
| ALC product | What it’s for | Safe on | Rate |
| OxStar Lawn Fertiliser & Weed Preventer (Oxadiazon) | Pre emergent herbicide that stops weed seeds germinating: winter grass, summer grass, crabgrass, crowsfoot, creeping oxalis. Also feeds the lawn | Sir Walter,Sapphire Buffalo; Augusta, Empire, Nara Native Zoysia; IronCutter Elite Hybrid Bermudagrass; Wintergreen Couch. Safe on freshly laid turf because it’s not root-absorbed | 4 kg per 100 m² in late winter |
| Bow & Arrow Herbicide (MCPA 300 g/L, Clopyralid 20 g/L, Diflufenican 15 g/L) | Post emergent broadleaf herbicide for bindii, clover, oxalis, dandelion, catsear, plantain. Always read the label | All ALC Buffalo (incl. Sir Walter), Zoysia, IronCutter, Wintergreen Couch at label rate. Always spot-test first | 50 mL in 5 L of water per 100 m² |
| Amgrow Bin-Die (Bromoxynil + MCPA) | Buffalo-safe broadleaf weed killer. Controls bindii. Always read the label | Sir Walter, Sapphire Buffalo, plus Zoysia, Fescue, and Rye lawns | Per Amgrow label, vary by weed |
| Tempra Nutgrass Killer 25 g | Post emergent for nutgrass and tougher sedge infestations. Always read the label | Safe for Zoysia, Buffalo, and Couch | 25 g covers 1,900 m² |
| Lawn Play Aquaturf Wetting Agent | Fixes dry patches and helps herbicides and water soak in evenly | All ALC turf varieties | Per label |
For Mullumbimby Couch and bigger sedge infestations, ALC’s Lawn Weeds guide recommends a halosulfuron-methyl-based selective like Apparent Halosulfuron, available through ALC. Ring 07 5541 7000 first; the program varies by turf type and season.
Pre-Emergent vs Post-Emergent, Which Do You Need?
Pre-emergent herbicides are effective in preventing weed seeds from germinating and should be applied before weeds emerge from the soil. OxStar is ALC’s go-to. It also feeds the lawn while it blocks seed germination.
Post-emergent herbicides target weeds that are already growing and should be applied according to label instructions for best results. Bow & Arrow and Bin-Die cover the broadleaf weeds most homeowners face.
The 10°C rule. Always test soil temperatures before starting. Once soil holds at 10°C in late winter, weed seeds start to germinate. That’s your action window for OxStar. In SEQ, that usually lands late July through August, but test your soil with a probe before you apply.
Winter Weeds: Winter Grass and Bindii
Winter Grass (Poa annua) is a low-growing turf grass with soft, drooping green leaves and triangular seed heads that shows up in cool weather. Poa annua spreads by producing thousands of seeds per plant, so hand removal alone won’t keep up. Put OxStar down in late winter before soil hits 10°C to stop the next generation.
Bindii (Jo-Jo) is a low-growing weed with a flower at the centre and green carrot-like leaves. It produces prickly seeds as it dries out in warmer months. Hit it with Bow & Arrow in late winter or early spring, well before those sharp spines harden off. Miss that window and you’ll be walking on burrs by December.
Summer Weeds: Summer Grass, Crabgrass, and Creeping Oxalis
Summer Grass and crabgrass thrive in the warmer months and spread through long stems and seeds that drop into thin spots in the yard. Prevention beats cure: feed the lawn, mow at the right height, and run an OxStar cycle heading into spring.
Creeping Oxalis (Oxalis corniculata) is a highly invasive weed that roots at each node and produces small yellow flowers, making it difficult to control once established. It spreads through explosive seed pods that fling seeds into garden beds and garden areas. Spot treat with Bow & Arrow, then follow with OxStar to stop new weed seeds germinating.
Broadleaf Weeds: Clover, Dandelion, and Friends
Clover (Trifolium) is a common lawn weed identifiable by its oval-shaped clover-like leaves with a white circular marking. Flowers can be white, pink, red, or yellow. Clover usually flags a lawn that’s low on nitrogen, so feed the grass as you treat the weed.
Dandelions (Taraxacum) are easily recognised by their bright yellow flowers and deeply notched leaves. They form a rosette and produce a long taproot that’s difficult to remove completely. For hand removal, use a small spade and pull the whole root system. Snapping the taproot almost guarantees regrowth.
Other broadleaf weeds you’ll meet: catsear (false dandelion with hairy leaves), cudweed, plantain or “lambs tongue”, black medic with small yellow flowers, and black nightshade with dark green leaves and small white flowers. All fall to Bin-Die or Bow & Arrow at label rate. Always read the label.
Sedges: Nutgrass and Mullumbimby Couch
Nutgrass (Cyperus rotundus) is a noxious sedge weed identifiable by its triangular stems and lighter green leaves that grow taller than surrounding grass. It produces nut-like tubers (brownish-red) underground. Mullumbimby Couch (Cyperus brevifolius) is the other common sedge: triangular stems, short rhizomes, fibrous roots, and it loves wet ground.
Sedges don’t respond to normal broadleaf or pre emergent products. Hand removal with a small spade helps for small patches, but you must get every tuber. Any leftover bulb will resprout. For bigger infestations, ALC’s Tempra Nutgrass Killer or Apparent Halosulfuron is the program. Ring ALC and we’ll point you at the right one.
Hand Removal: When it Works, When it Doesn’t
Hand removal of weeds can be effective, but the entire root system must come out to prevent regrowth. It works well for:
- Dandelions with a single taproot (small spade, steady pull).
- Isolated clover patches before flowering.
- Young bindii plants before they set seed.
- Small nutgrass clumps where you can lift every tuber.
It doesn’t work for large runs of creeping oxalis, Mullumbimby Couch mats, or any weed that has already dropped seed. At that point you need a pre emergent plus a selective herbicide.
Why Your lawn Keeps Getting Weeds
Nine times out of ten, it’s not a spray problem, it’s a lawn health problem. Effective lawn care includes maintaining appropriate mowing heights, deep watering, regular fertilisation, and aeration.
Regular mowing helps control weeds by stopping them going to seed and spreading throughout the lawn.
Maintaining a healthy lawn through proper watering and fertilisation also helps prevent weed infestations by promoting dense grass growth that physically crowds weeds out.
Common triggers ALC’s team sees in SEQ yards:
- Thin turf from scalping or shade.
- Compaction from foot traffic and parked trailers.
- Overwatering or poor drainage.
- Missed fertiliser cycles in mid spring and autumn.
- Weed seeds blowing in from neighbouring garden beds.
If the same spots keep flaring, add Lawn Play Aquaturf Wetting Agent so water and product soak evenly into the soil instead of running off.
Thicken the Lawn So Weeds Can’t Come Back
A dense, well-fed lawn is the cheapest weed control you’ll ever buy. ALC’s varieties that work hardest for this in SEQ:
- Sir Walter Buffalo, Sapphire Buffalo. Shade-tolerant, thick coverage that smothers common weeds.
- Augusta Zoysia, Empire Zoysia, Nara Native Zoysia. Tight growth habit and low nutrient needs.
- IronCutter Elite Hybrid Bermudagrass. Recovers fast and outcompetes summer grass and crabgrass.
- Wintergreen Couch. Vigorous summer growth that chokes out weed seedlings.
Pair your turf with:
- A seasonal OxStar cycle (late winter and early autumn).
- The right ALC lawn fertiliser from our fertiliser range.
- Mowing at the recommended height for your variety.
- Deep, less frequent watering rather than daily sprinkles.
When to Call ALC’s team of specialists
Some jobs need a pro: sedges, paspalum, repeat infestations, or new lawns that keep getting reinvaded from the fence line.
Send us a photo, and we’ll identify the weed and recommend the right product or program from our own shop. No upselling, no guessing.
Call 07 5541 7000, email customerservice@alcturf.com.au, or book a Free Prep & Lay Quote.
People Also Ask
Here are some of the commonly asked questions about weed identification, pre emergent timing, herbicide safety, and hand removal, so you can read once and act on the same day.
1. What are the most common weeds in Australian lawns?
The most common weeds in Australian lawns are bindii, clover, creeping oxalis, dandelion, catsear, cudweed, and plantain on the broadleaf side, winter grass, summer grass, and crabgrass on the grassy side, and nutgrass and Mullumbimby Couch on the sedge side. Each group needs a different control plan.
2. What’s the difference between pre emergent and post emergent herbicide?
Pre emergent herbicides like OxStar prevent weed seeds from germinating and go down before weeds come up. Post emergent herbicides like Bow & Arrow and Bin-Die kill weeds that are already growing. Most SEQ lawns need both: OxStar in late winter, then a post emergent for anything that escapes.
3. When should I apply OxStar in Brisbane?
Apply OxStar in late winter, once soil temperature holds at 10°C. In SEQ that’s usually late July through August. Test the soil with a probe first, because applying too early or too late costs you the action window. The full rate is 4 kg per 100 m² for established lawns.
4. Is Bin-Die safe on Sir Walter Buffalo?
Yes. Bin-Die is formulated specifically for buffalo lawns and takes out bindii, catsear, clover, creeping oxalis, cudweed, dandelion, plantain, and thistles at label rate.
5. Is Bow & Arrow safe on Sir Walter and Buffalo lawns?
Yes, Bow & Arrow is safe on Sir Walter and other Buffalo lawns at label rate. It’s also safe on Zoysia, IronCutter, Wintergreen Couch, and kikuyu (with possible slight yellowing). Always spot-test on a small area first and apply at the recommended rate of 50 mL in 5 L of water per 100 m².
6. How do I get rid of nutgrass or paspalum?
Hand-remove small nutgrass patches with a small spade, ensuring every tuber is removed. For larger infestations, use Tempra Nutgrass Killer (25 g covers 1,900 m², safe on Zoysia, Buffalo, Couch) or ring ALC’s team for a tailored program. Paspalum control varies by turf type, send us a photo first.
7. Can I use a normal weed killer on a freshly laid lawn?
No. Most herbicides will damage new turf because the root system isn’t established yet. OxStar is the safe pre emergent on freshly laid ALC turf because it’s not root-absorbed and doesn’t disrupt root development. Wait at least 6 weeks before applying any post emergent on new turf.
8. Why do my weeds keep coming back?
Weeds keep coming back when the lawn is thin, compacted, under-fed, or under-watered. Weed seeds blow in from neighbouring garden beds and find space in patchy turf. Fix the lawn health first (mow at the right height, deep weekly watering, two slow-release feeds a year), then run a pre emergent + post emergent program.
9. What’s the safest weed killer for a lawn with kids and pets?
Bin-Die and Bow & Arrow are both lawn-safe at label rate. Keep kids and pets off the lawn until the spray has dried, usually 1 to 3 hours, then it’s safe to play on. For full peace of mind, hand-remove isolated weeds before they set seed, and run a pre emergent program in late winter to stop new weeds emerging