Answer: A raised bed for vegetables is a great idea. Using untreated wood that is naturallu rot resistant would be a way to get a longer life out of the bed. Cedar and hemlock are two good choices. Using treated wood may be dangerous. The jury is still out on that one, but as you say, by lining the inside of the raised bed with plastic, you'll reduce the risk of exposure from any leaching chemicals. The plastic shouldn't pose a miold problem as long as the soil is well drained and you don't over water. Adrip system is a good way to concentrate the water to the areas that need it..
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