These are our raised beds, 30” high 3ft. by 7ft. interior space with a bench rail on top. This treated lumber with no paint or sealant added. They are notched together and can be separated to make two or more. There is about 53 cubic ft. of planting area with at least 30" of root space. Taken together it amounts to $6.00 a cubic ft. of growing space. These do not need to be moved for hurricane or floods. They could act as an anchor for shade or covering when filled with soil. They could be a great play area for children.
If we compare them to the "Best Sellers" at the box stores which give 8 cubic ft. of growing space with less than 12” of root space. 30” high. It will take about 5 bags of garden soil to fill the growing space with the cost being about $8-9.00 each, so about $50.00 in all plus the cost of the bed @$130-150.00 the total cost is $200.00. this is $25.00 a cubic ft. of planting area.