Answer: You can either till the area and then rake out the grass and roots, or cover over the area with cardboard or 6 sheets of newspaper then lay a sheet of plastic on top of that. It will take most of the summer to kill the grass in this manner, but it is reasonably efficient. Once the grass is dead you can either rake it out of the area or rototil it in. After removing the grass in the proposed flower bed you can amend the soil with organic material such as compost, dig it in, level the area and then cover it all with a weed barrier fabric to suppress future weeds. After than it done, cut slits or crosses in the weed barrier to plant your plants. You can disguise the weed barrier fabric with a decorative mulch such as bark nuggest, shredded bark or decorative rocks.
Best wishes with your new flower garden!
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