How to Get Rid of Bindii (Jo-Jo) in Your Melbourne Lawn

Bindii - also called jo-jo in some parts of Victoria - is the bane of many Melbourne lawns, particularly in areas like Diamond Creek, Eltham, and Hurstbridge where properties often have established turf with problem histories. Those prickly, painful seed heads in spring are unmistakable, but by the time they appear, the plant has already done most of its damage.

The good news is that bindii is highly preventable and manageable if you understand its lifecycle and plan your treatment around it. Let us walk through identification, timing, treatment options, and long-term prevention.

What Is Bindii and Why Is It a Problem?

Bindii (Soliva sessilis, formerly known as Soliva pterosperma) is a low-growing winter annual broadleaf weed. It germinates in autumn (March-May) when soil temperatures drop, grows through winter as a small rosette plant, flowers in spring, and produces those notorious prickly seed heads by October-November.

The distinctive seed heads are what most people know bindii by. Each plant produces hundreds of tiny, needle-like seeds clustered in a sphere (hence the "jo-jo" nickname). These seeds are painfully sharp and stick to shoes, bare feet, and pet paws. They can be genuinely dangerous on a lawn where kids or pets play barefoot.

The real issue is that bindii only establishes in thin, weak, or poorly maintained turf. Dense, healthy grass crowds it out. If you see significant bindii, it is a signal that your lawn needs attention.

Identifying Bindii in Your Lawn

Early identification makes treatment far easier. In winter, bindii appears as a small rosette plant - 2-5cm across when young, with thin, finely-divided light green leaves arranged in a tight circular pattern close to the ground.

Young bindii is often hard to spot because it blends in with dormant or thin turf. By spring (August-September), once it starts flowering, it becomes much more obvious. Small yellow flowers appear, followed within weeks by those distinctive prickly seed heads.

If you are not sure whether a plant is bindii, the rosette shape and finely-divided feathery leaves are the key identifiers. Other similar-looking weeds exist, but true bindii has that characteristic appearance.

When to Treat: Timing Is Everything

The timing of bindii treatment determines how effective it will be. There are three strategic windows:

Best: March-April with pre-emergent herbicide

This is the preventive approach and by far the most effective. Apply a pre-emergent herbicide (also called a preventive herbicide) in March-April, before bindii seeds germinate. Products containing ingredients like trifluralin or pendimethalin create a barrier in the soil that prevents bindii seeds from germinating in the first place.

The advantage of this approach: you prevent the problem entirely rather than trying to fix it after the plant is established. If you have had bindii problems in previous years, pre-emergent treatment in March-April is the single best investment you can make.

Good: May-June with post-emergent herbicide

If you missed the pre-emergent window, treat established bindii plants with a post-emergent herbicide (a selective broadleaf herbicide that kills bindii but not grass) between late May and early June. At this point, plants are small to medium-sized and have not yet flowered or produced seeds.

The critical deadline is before flowering begins (usually late July-August). Once plants flower and produce seed heads, herbicides become less effective, and you risk seed shattering and spreading even more weed seed across your property.

Acceptable but challenging: July-August

You can treat plants up until they flower, but this window is much tighter and the plants are larger, so herbicide efficacy decreases. Do not wait until seed heads have formed - by that point, treatment is largely damage control.

Herbicide Options for Bindii

Pre-emergent herbicides (preventive): Applied in March-April before germination. Examples include products containing trifluralin or pendimethalin. These create a soil barrier that prevents seeds from germinating. They require application before rain or watering to activate, and should not be used if you plan to overseed in autumn (as they prevent all seed germination, not just weeds). They typically provide 3-6 months of protection.

Post-emergent selective herbicides: Applied to actively growing bindii plants in May-June. Look for products specifically labelled for bindii or broadleaf weeds that are safe for use on lawn. Examples include products containing MCPA or 2,4-D. Always follow label directions and apply when temperatures are moderate (not in extreme heat or cold).

Non-selective herbicides: Products like glyphosate (Roundup) will kill bindii but will also kill your grass. These are only suitable for spot-spraying individual weeds or using on bare patches. Not recommended for general lawn treatment.

When applying any herbicide, always read and follow the label directions, wear appropriate protective gear, and avoid application during extreme weather or when rain is forecast within 24 hours.

Mechanical Removal

If you prefer not to use herbicides, you can hand-pull bindii plants, particularly when the soil is moist after rain. The challenge is that bindii plants have deep taproots, and if you break the root off in the soil, the plant will often regrow.

For reliable mechanical removal:

• Wait until the soil is soft (after rain or watering)
• Use a weeding fork or tool to lever the entire root system out
• Get as much of the taproot as possible
• Do this in May-June before flowering - do not wait until seed heads are present
• Dispose of plants in a sealed bag (do not compost, as seed heads can spread)

This approach works fine for a few scattered plants but is impractical for lawns with moderate to heavy bindii infestation.

Long-Term Prevention: Build a Strong Turf

Once you have eliminated bindii from your lawn, the best long-term strategy is prevention through turf management. Bindii establishes in weak, thin, or poorly maintained turf. Dense, vigorous grass simply crowds it out.

Consistent mowing: Regular mowing at an appropriate height (35-50mm for most varieties in Nillumbik) encourages thicker, denser growth. Mow every 7-14 days during the growing season rather than occasional heavy cuts.

Appropriate fertilising: A thin lawn is a weed magnet. Apply a balanced fertiliser in spring and autumn to promote thickness and density. Slow-release formulations are ideal as they provide consistent nutrition without promoting soft, disease-prone growth.

Watering strategically: Deep, infrequent watering produces deeper roots and more resilient turf than frequent shallow watering. A healthy root system means the grass can outcompete weeds for water and nutrients.

Addressing bare patches: If you have bare patches or thin areas, these are prime real estate for bindii (and other weeds). Overseed or lay turf in these areas so bindii does not get established in the first place.

Annual pre-emergent treatment: Once you have cleared bindii from your lawn, applying a pre-emergent herbicide every March-April (at the same time each year) prevents new germination from dormant bindii seed that may remain in your soil.

Frequently Asked Questions

Is bindii toxic or dangerous?

The seed heads are definitely painful if stepped on barefoot or if they stick to skin, but bindii itself is not toxic. The main concern is the physical pain of the prickles, which can be particularly problematic for families with young children or people who enjoy barefoot garden activities. Prevention of seed head formation is the primary concern for most property owners.

Why do I keep getting bindii every year?

Bindii reappears annually because: (a) Your lawn is still thin or stressed, allowing bindii to establish each year, or (b) Previous plants that set seed have left a seed bank in your soil that germinates each autumn. If you had a bad bindii year 2-3 years ago, you may still have viable seeds in the soil. Combine regular turf improvement with pre-emergent treatment to break the cycle.

Can I treat bindii in summer or winter?

Herbicide treatment is most effective when bindii plants are actively growing, which is autumn through spring. Treating in summer when bindii is not actively growing (or not yet germinated) will not be effective. Once you have an established plant problem, the May-June treatment window is ideal.

Will one herbicide application clear my entire bindii problem?

A single treatment will control the majority of active bindii plants in one season. However, bindii seed can remain viable in soil for multiple years. If you have had recurring bindii problems, plan on annual pre-emergent treatment or ongoing maintenance to prevent new germination from remaining seed.

My lawn is predominantly bindii with only scattered grass - can I still save it?

Yes. Treat the bindii in May-June, then immediately overseed or lay new turf into the cleared areas in June-July. Follow with consistent regular mowing and appropriate fertilising. Within 12 months of consistent management, a heavily infested lawn can recover to good condition.

Need Professional Help?

Bindii treatment is straightforward, but timing and product selection matter. We can assess your lawn, recommend the best treatment strategy, apply pre-emergent or post-emergent herbicide at the optimal time, and help you build a maintenance plan that prevents recurrence.

Our team has treated hundreds of bindii-affected lawns across Diamond Creek, Eltham, Hurstbridge, Greensborough, Templestowe, and surrounding areas. Give us a call on 0407 335 937 or book online and we will get your bindii problem sorted before next spring.