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Try spray the lawn grass with Try 'Yates Zero Rapid 1-Hour Action Weedkiller Ready-To-Use'. to kill weeds fast. See most weeds start to die in 1 hour but the active constituents are not active in soil, so will not impact tree roots. The area is ready to replant in 7 days time. Click here for more info on this product: https://www.yates.com.au/product/garden-weed-control/general-garden-weed-control/yates-zero-rapid-1-hr-action-weedkiller
Hope this helps and please do not hesitate to contact us again should you have any other query.
Answered: 27 Aug, 2021