Here's a list of the best free DIY raised garden bed plans & ideas for inspirations.. you want to plant that might be taller then plant them on the bottom tier.
Preparing the bottom of a raised bed garden box.. Good for flower bed– Lay down a thick layer of CARDBOARD in your raised garden beds to kill the grass.
Make easy raised garden beds from 2 pallets ~ frames are built from the pallet runners and a vertical dado is cut on either side in which the horizontal side .
Fill It with Soil. If you have problems with burrowing creatures like gophers, lay some chicken wire at the bottom of the raised bed before you fill it with soil (Image 1). Remove some of the native soil you've dug up so the chicken wire can lie at ground level. Don't fill the whole bed up with potting soil.