Do I have to seal pressure treated wood planter boxes?
My friend is putting together some wooden planter raised bed boxes for vegetables. The wood is pressure treated and he thinks the wood has to be painted to seal out copper and arsenic. I can't recall ever seeing painted raised beds. Seems to me they are usually bare wood, but I don't know if they're pressure treated. So - should the wood be painted? If so, can it just be primed on the insides? Thanks!