HI I purchased a raised bed stacking joint system from Harris Seed Co. which is designed to be used with 2" x 6 " lumber
Home Depot told me to use pressure treated (I know that is not right it's a veggie garden) One lumber yard told be to use construction heart redwood at a cost of $22.50 per 10 ft board. Another lumber yard told me to use cedar at a cost of $23.50 per 10 ft. board. I called Harris Seed they told me to use pine board it would be about a third of the cost and in 5 to 6 years I may have to start replacing some boards. I would need 8 2" x 6" X 8ft and also 16 2" x 6" x 10ft to complete this project. I live in Alabama about 2 miles from the GA border. Which lumber should I use?