Can I set up raised beds on lawn?
Raised beds can be set up directly on lawn with little or no preparation. Beds 11 inches and taller are generally deep enough to smother buried grass before it can reach the surface. All that is needed, in this case, is to level the ground before setting up the planter.
Some rhizomic weeds and grasses, however, can surface through very deep soil. To prevent this, cover the ground with a layer of cardboard or thick newspaper before filling the raised beds with soil. The paper will break down over time, along with the grass beneath it, and eventually become compost for your garden.