Quack Grass

Asked January 30, 2018, 3:24 PM EST

I have Quack Grass growing and spreading over my entire front lawn. I have 3 questions: 1. In the Spring, would it be feasible to spray Round Up on the entire lawn to get rid of the Quack Grass? 2. If so, How long would I need to wait before putting down black dirt, fertilizer and seed or sod? 3. I have a 1 yr. old Maple tree in this area. How far away should the Round Up be from the tree. I do not want to harm my new tree.

Dakota County Minnesota lawn renovation

1 Response

Quack is very difficult to get rid of. It would be feasible to spray you lawn with Round Up to get rid of it. The problem is that you probably will need to reapply in order to completely get rid of it. Any part of the root that isn't destroyed will start to grow again. You will want to wait at least a couple of weeks before spraying again to see if any new growth appears. Make sure that you follow the label directions exactly. Make sure the temperature is warm enough and that you don't use more than instructed. Round Up is a nonselective herbicide and will kill whatever you get it on so you will want to make sure that you don't get it on your tree but it doesn't leach down into the soil. If the quack is tangled up in the roots of the tree it is possible that it could affect the tree but not likely. It is not a good idea to seed or sod under a tree anyway so you should plan to mulch under your tree instead. I will give you some links to info that should help you with your project. http://www.extension.umn.edu/garden/landscaping/implement/trees_turf.html . http://www.extension.umn.edu/garden/turfgrass/repair/renovating-lawn/index.html . http://www.extension.umn.edu/garden/turfgrass/pests/weed-control-in-lawns/index.html . http://www.mda.state.mn.us/news/publications/chemfert/applicationguide.pdf