I work for a non-profit senior's housing society. We have 48 slightly-raised garden plots and are contemplating what to use for re-doing the wood. Rona suggested 3 1/2" x 3 1/2" garden ties = $5.77 2"x6" pressure treated = $6.43 2"x8" pressure treated = $9.03 Pressure treated wood seems to be inappropriate due to the chemicals, but plain wood is not going to last long. We want an inexpensive solution. I've looked at the blogs and I'm wondering if the pressure treated wood has improved?