Lay down a thick layer of CARDBOARD in your raised garden beds to kill the grass. It is perfectly safe to use and will fully decompose, but not before killing any grass below it. They’ll also provide compost and food for worms.
This is the coolest gardening site EVER! On the Gardeners Supply Company website you can design your own garden beds by clicking and dragging the plants you want, where you want them. Then you can print your planting map WITH very detailed planting directions.Cool!!