While I now this isn't really "container gardening" I did not see any other subject area to ask this question. In the past, there has been a lot of discussion regarding treated vs. nontreated wood for raised beds. Is it safe/healthy/acceptable to use treated lumber for raised beds if I am not planting root crops? And if I do plant root crops, can I use treated wood on the lower section closest to the ground then regular lumber in the top 12" or so? Any advice will be great.