Answer: The best course of action is to rototill the dead lawn area then rake and remove the debris. If you used an herbicide to kill the lawn, it has probably degraded by now and there shouldn't be any residual action which would harm the roots of your new plants. After removing the debris, rake the area level, reseed the areas you want lawn in and add topsoil for your raised beds. Doing it yourself is labor-intensive, but by the end of the summer you should have a brand new landscape at only a fraction of the cost.
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