Answer: Although the best way to prepare the area is the most labor-intensive, you'll be rewarded with years and years of problem free garden if you take the time to completely remove the grass before laying down your weed barrier fabric. Weed barrier will exclude light (which will keep weed seeds from germinating), but it allows water to penetrate, which will help keep the soil well drained. I'd remove the grass by scraping it away (2" deep will get most of the roots), then lay a weed barrier down and cover it with 2-3" of mulching material. Best wishes with your landscape!
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