Build An Easy, Inexpensive Wood Planter Box by Adeline Louis
See how’s a planter box you can make for around $20. The author used 2x4s and garden edging (bender board). This will rot away sooner than other types of wood, but for 20 bucks, I’ll just build another one when this finally rots! Or course, you can use these same techniques on teak or cedar if you wanted something more permanent.