How do you get rid of yarrow in a lawn? It is the variety that grows on roadsides all over NW Tasmania. I have been using Round-up, which seems to kill it, but next season it is back again. Thank you for your help.
Certified GKH Gardening Expert
Common yarrow can be quite invasive and difficult to control. They spread through roots, which is why you have been having some issues with controlling it with Round-up. It just does not get deep enough with a surface application. This is a plant that needs to be dug up. I would recommend digging up as much as you can, then applying either Round-up or boiling water to the area where it was, to kill off any of the remaining roots. Be aware that both Round-up and boiling water will kill whatever plant growth it touches.