Bindii in your lawn? You have about 6 weeks to stop the prickles.

If you can see bindii in your lawn right now, in the middle of July, you are in the best position you will be in all year. That sounds backwards. Most people only think about bindii in November, when they walk on the lawn barefoot and feel it. By then it is too late. The prickle you are standing on is the seed, and once that seed has formed and hardened, killing the plant does nothing to stop it. Right now, through to the end of August, is the window where bindii is actually beatable.

What bindii is and why the timing works the way it does

Bindii (Soliva sessilis), is a winter annual broadleaf weed. Its entire life plays out inside 1 year and the sequence never changes.

It germinates in autumn as soil temperatures drop. Through winter it grows as a low flat rosette, no more than 5 to 10cm across, with fine feathery leaves that look like a carrot top or a sprig of parsley. It is bright lime green and it sits flat enough that a mower passes straight over it. Most people never notice it at this stage.

Then in spring, from around August through to October, it flowers and sets seed. The seed pod is the prickle. That is the entire point of the plant. Everything it does through winter is preparation for that one moment.

Here is the part that matters. Once the seed has hardened it stays in the soil whether you kill the plant or not. Spraying a bindii lawn in November gives you a dead bindii plant and a lawn that is still full of prickles, plus a seed bank sitting there ready to germinate again next autumn. You have not solved anything. You have just wasted the herbicide.

Kill it in July or August and the seed never forms. That is the whole game.

How to be sure it is bindii

Get down and look at it properly. Bindii grows flat to the ground in a rosette, spreading outward rather than upward. The leaves are finely divided, almost like a fern, and bright green. There is a small flower at the centre of the rosette that is easy to miss.

It is not winter grass. Winter grass (Poa annua) is a grassy weed with fine blades that grows in clumps, and it needs completely different treatment. That distinction decides which product works and it is the single most common mistake we see. We cover the full split in winter weeds taking over your lawn.

Spray it now

Bindii is not a tough plant. Treated with the right selective herbicide while it is actively growing, it dies. Killing bindii has never been the hard part. The hard part is that almost nobody treats it while it is still worth treating.

Bow and Arrow is the product we recommend and it is registered specifically for bindii. It is a selective broadleaf herbicide with 3 active ingredients: MCPA at 300g per litre, clopyralid at 20g per litre, and diflufenican at 15g per litre. The rate is 50ml in 2 to 5 litres of water per 100m2 through a pressure sprayer.

It works more slowly than the fast burn broadleaf herbicides. Expect up to 6 weeks for complete death, faster on small plants. That slowness is the feature rather than the fault. The quick products scorch the leaf and the weed recovers from its root system. Bow and Arrow takes the whole plant and there is no regrowth.

The label is specific on a few points and they matter:

• Apply to actively growing weeds. Do not spray if the lawn or the weeds are stressed, or if frost is coming.
• Apply at least 4 hours before rain so it absorbs through the leaf.
• Do not mow for 3 to 4 days either side of spraying.
• Transient discolouration can occur on kikuyu, carpet grass, and Queensland blue couch. It passes.
• Some buffalo varieties, ST85 in particular, react more strongly. Test a small area first.
• Do not use it on bent grass or winter grass species.
• Diflufenican has residual activity in the soil. Do not oversow treated areas for 3 months.
• Repeat in 3 weeks if new bindii germinates after the first pass.

Bow and Arrow is arriving in our range shortly. If you want to know the moment it lands, email us at info@turfandsurf.com.au and we will tell you.

Why bindii got into your lawn in the first place

This is the part no herbicide fixes. Bindii is an opportunist. It establishes in lawns that are thin, compacted, and dry, in soil that is short on nutrition and slightly acidic. It does not force its way into a dense lawn, because there is nowhere for it to go. Every bindii seed needs a gap and bare soil to germinate into.

So you can spray every single winter for the rest of your life, or you can build a lawn that stops handing bindii somewhere to land.

That starts with the soil. Soak at 200ml per 100m2 breaks the water repellency in hydrophobic soil so water reaches the root zone rather than running off into the low spots where weeds sit. Vital at 100ml per 100m2 uses natural auxins and Vitamin B1 to drive the lateral root development that thickens the turf and closes those gaps. Base at 120ml per 100m2 conditions the soil biology with Tasmanian Bull Kelp so the whole root zone functions properly. All 3 go on together in the same sprayer and get watered in immediately.

Through winter, Vivid at 200ml per 100m2 holds colour in the leaf. Apply it to the leaf and leave it 2 hours before watering in.

Spray the bindii this month. Build the lawn so that next autumn there is nothing for the seed to germinate into. Those are 2 different jobs and you need both.

Complete the program

If your lawn is thin enough that bindii has taken hold, the Starter Pack is the right entry point. It covers Soak, Vital, and Surge, which is the foundation most Australian lawns need before anything else will hold.

The Turf & Surf 5-step program sets out the full monthly routine, every product, every layer, every month. A dense lawn is the only weed control that works permanently.

Frequently asked questions

When is the best time to spray bindii in Australia?
Winter through to very early spring, while the plant is actively growing and before the seed pod forms. In most of Australia that means June through August. Once you can feel prickles underfoot, the seed has already set and spraying will not remove them from the lawn this season.

I sprayed in summer and the prickles were still there. Why?
Because the prickle is the seed, not the plant. By summer the plant has already done its job and the seed is in the lawn. The herbicide killed the plant exactly as it was designed to. It just cannot un-form a seed that has already hardened. Spray in July next year instead.

Is bindii the same thing as winter grass?
No. Bindii is a broadleaf weed with flat feathery leaves in a rosette. Winter grass is a grassy weed with fine blades growing in clumps. Broadleaf herbicides have no effect on winter grass, and this is where most people waste their money. If you are not sure which one you have, send us a photo at info@turfandsurf.com.au.

Can I just pull bindii out by hand?
For a small patch, yes. It is shallow rooted and comes out easily. Get the roots and do it before the seed sets. For anything beyond a few square metres it is not realistic, and any plant you miss still seeds the lawn for next year.

Will bindii come back next year if I kill it this year?
If seed from previous seasons is already in the soil, yes. That seed bank stays viable for years. This is why the lawn itself matters more than the spray. Killing the plant before it seeds stops you adding to the bank, and a dense lawn with healthy soil stops what is already in there from finding a gap to germinate into.