Barrier under landscape mulch
Thanks for writing. It's best to remove or kill the grass before you do any planting. You can try a herbicide or you can cover the grass with cardboard and mulch. If you go with the cardboard/mulch route, you'll need to wait six months or so before you plant to make sure all the grass has died.
Get more tips here! http://www.bhg.com/gardening/yard/garden-care/building-a-new-garden/
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