Raised garden bed with concrete blocks-lasts longer than wood. One can also opt to paint or stain the blocks some viberent colors. Fill the holes in the blocks with soil and grow pest fighting flowers alternating with bunch or green onions. The filled blocks are much more stable against the pressure of the soil inside the raised garden bed.
An excellent step by step on building a raised bed with cover. Use plastic for winter (and extending seasons) or shade cloth/netting for spring and summer use...Build a raised bed cloche in 8 steps | Living the Country Life
I want to make this! DIY Furniture Plan from Ana-White.com Cedar raised bed make gardening easier, more accessible, more economical, and more efficient. But often a cedar raised bed can cost hundreds of dollars. With this plan, I figured out how to create raised cedar beds - deep ones - for about $10 each.
Easy instructions on constucting a raised bed garden. Also have read to use cardboard for killing off grass underneath and good compost for worms and to use chicken wire to keep moles and critters out!