Hanging herbs - love this idea.

The materials for a the raised bed:

1. One 6-foot-long 4-by-4
2. Six 8-foot-long 2-by-6s
3. One 10-foot-long 1-inch PVC pipe
4. Two 10-foot-long ½-inch PVC pipes
5. 32 3½-inch #14 wood screws and 16 ½-inch #8 wood screws
6. One 4- by 10-foot roll of ¼-inch-mesh hardware cloth
7. Eight 1-inch galvanized tube straps
8. 32 cubic feet (1 1/5 cu. yd.) soil mix (look for combination of topsoil,
9. compost, and potting soil).

With a table or power saw, cut the 4-by-4 into four 16-inch-tall corner posts. Cut two of the 2-by-6s in half. Cut the 1-inch PVC pipe into four 12-inch-long pieces and the ½-inch PVC pipes into 6-foot-long pieces. Assemble pieces on a hard, flat surface.

 via : 10 raised bed gardenideas