You can use treated lumber to build your raised garden beds. Most people who intend to grow edible plants in their garden, such as vegetables, opt to line the raised bed with plastic.
Treated lumber is wood that has been well treated with chemical preservatives. These preservatives help in prolonging the intended use of the wood as compared to the untreated wood.
Despite the fact that pressure-treated timber is safe, it is not recommended for use in gardens meant to grow food crops. However, it can be used when an impermeable liner is placed between the wood and the soil.
Yes! Pressure-treated wood is safe for vegetable garden beds but with some precautions.
Instead of using CCA treated wood, you can use alternatives such as concrete blocks, plastic lumber, bricks or stones. You can also use wood treated with ACQ (alkaline copper quaternary ammonium) which contains no toxic chromium and arsenic.