Answer: If you are planting directly in the area where the old grass was rather than importing some topsoil, I would dig the grass and rake it out, roots and all. It sounds like a lot of work but it will ensure that no deeply buried roots will spring to life once you've planted the bed and begin watering it regularly. After planting, mulch over the bare soil to keep any dormant grass seeds from sprouting. Best wishes with your new garden!
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