You can isolate pressure-treated wood by lining the inside of a bed with heavy plastic to prevent leaching of chemicals from the wood into the soil. Top your bed with boards of untreated lumber to make a flat top to sit on and to avoid contact with the wood, particularly if you have CCA-treated wood in your garden.
Is the new pressure-treated "Nature Wood" safe to use as a framing material for a raised bed vegetable garden? We would also like to know about non-toxic .
Cover CCA-treated wood used for raised garden beds or borders with heavy plastic to prevent contact with garden soil. Manage your garden soil to reduce plant availability As, Cr, and Cu.
It depends on the preservatives used to treat the wood. Wood treated with CCA or chromated copper arsenate can leach arsenic, a very toxic compound. Plants growing in the garden bed may take up the chemicals. CCA-treated lumber shouldn't be used for garden beds and restricted to construction work only.
Pressure treated wood can be safely used for above ground raised garden frames.
Raised–bed gardening is a popular technique for growing plants in Missouri.. gardens. Pressure-treated lumber using CCA (chromated copper arsenate) as a
Raised–bed gardening allows you to have good soil without digging or applying soil amendments such as lime or sulfur. Raised beds bring plants up closer to .