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A: The safety of pressure treated lumber for raised bed gardens has been examined by several researchers. From what I've seen, the consensus is that the chemicals do leach out of the wood into the soil and are uptaken by the plants in very small amounts.f course, the primary concern with using pressure treated wood in raised-bed gardens has been with the arsenic in CCA- (chromated copper arsenate) treated wood.
Most of the weight added to treated wood comes from water used to solubilize the preservative components. A freshly treated piece of lumber may contain as much as 4.5 gallons of water per cubic foot or about 38 lbs.per cubic foot.As the wood dries and the water evaporates, only the preservative will remain.Lumber tagged for above-ground use should contain 0.25 pounds preservative per cubic foot and, for ground contact, 0.40 pounds per cubic foot.ost of the weight added to treated wood comes from water used to solubilize the preservative components. A freshly treated piece of lumber may contain as much as 4.5 gallons of water per cubic foot or about 38 lbs. per cubic foot. As the wood dries and the water evaporates, only the preservative will remain.