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Welcome to the Bunnings Workshop community @Housereno1. It's amazing to have you join us, and many thanks for your question about removing weeds.
It's great to hear that you've received some local advice, as I trust they've likely got great experience with this issue. Would you mind posting a picture of this weed so our members have a better understanding of how they could assist? If we can't offer a chemical treatment solution, then there might be specific tools that would help remove these stubborn weeds. We have a four-prong Fiskars weeder tool that's fantastic at gripping and pulling out various weeds. Its action pulls the weeds directly up and out and it would be worth checking to see whether the motion will remove the taproot as well.
Keen to hear more about this issue.
Mitchell
Here are some photos that I took. Sensitive weed is the plant that closed up when you touch it.
That looks to be Mimosa pudica @Housereno1. Here's a fact sheet on them.
As you've mentioned, control measures involve digging it out and making sure the root is removed, and herbicides can be effective if you thoroughly wet all leaf surfaces. Make sure not to disturb the plant before application, as if the leaves fold up before the herbicide goes on, it will be ineffective. You might like to try Zero weedkiller in an applicator brush. However, the action of touching the leaves will likely activate the closing reflex very quickly. If this is the case, you could use a spray, but you'll need to use cardboard to prevent overspray onto your surrounding grass, as this product will kill it too.
Let me mention a couple of our horticultural experts, @Noelle and @Adam_W, to see if they have any thoughts.
Please let me know if you have any questions.
Mitchell
