I built two raised beds with 2x12 PT lumber. Knowing that PT lumber should not be used for edible gardening, even thought the manufacturers have changed the chemicals to a copper compound. I initially lined the entire inside of the box with 4mm plastic sheeting and stapled to to the top edge. I did not realize that the plastic would become brittle and shred.I am wondering if I could pull the dirt back and paint Kilz on the inside of the box to seal it. Is Kilz non toxic? Is the new PT lumber really dangerous as it leaches into vegetable garden soil?
