It's a good idea to line them with old grow-bag plastic bags or similar, so
as to minimise direct contact with the wood - and mean less watering. Old
fence boards and ship lap loaded with old black creosote make particularly
effective planters. A lot of plants - particularly the cabbage family - are
actually bioaccumulations of toxic metals, so, it would not be advisable to
use this for edible crops (Mind you, if we are talking raised bed sized
planters most of the plants would probably be far enough away from the sides
for this only to be a remote toxicity problem.).
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