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Pre-emergent weed killers target weeds before they've had the chance to germinate. I recommend Lawn Solutions Australia 3kg Oxafert Herbicide & Fertiliser. This type of weed control is best done in autumn or winter, depending on the weed you're trying to control.
Selective weed killers don't harm most varieties of grass. Some of them will even feed your lawn while killing the weeds. I recommend Yates 2.4L BuffaloPro Weed 'n' Feed Hose On Weed Killer. It is typically best used in spring. Simply attach to the hose and spray your lawn according to the instructions on the pack.
Non-selective weed killers won't be fussy about what they kill. They will destroy any plant life that they come in contact with, including your lawn and shrubs. This makes them incredibly strong and effective for tough weeds but also means you have to be extra careful when you apply.
For direct intervention, I suggest using Yates 1L 490g/L Zero Weed Killer Super Concentrate. Please remember that any accidental application of this weed killer on any other plant (including the turf) will kill it. Application must be directly applied to the weed only. I recommend using Yates Zero Weeding Herbicide Applicator Brush. The specially developed valve on the brush prevents any leaking, and the easy to apply brush mechanism makes spot weeding easy without back-breaking bending.
For organic gardening, vinegar can function as a natural weed killer. You can also pour boiling water on your weeds to kill them off. Take care when pouring the boiling water to ensure it doesn't make contact with your skin or splash back. Boiling water will also kill any lawn it is poured on. Check out the Bunnings range of organic and naturally derived herbicides for other options.
Manual weed removal is a good strategy. Using a weeding tool, make sure you pull out the entire weed, including the roots. Place the weed directly into a bucket so it won't spread to other parts of your grass. I also suggest cutting your lawn short to prevent weeds from establishing.
When using chemicals, please make sure to wear personal protection such as appropriate clothing, gloves, goggles and a mask. Please make sure to follow all the safety guidelines at the back of the bottle. - EricL
