Construction of raised beds
Redwood is one of the best materials you can use for Grow-Boxes, for the same reason it's great for decks and patios, and even for house siding. It is very resistant to rotting.
It's also very expensive, however, and so usually the only way people get it is when it's used.
If someone is removing a wooden deck or patio, see if the wood is redwood, and then get it if you can.
To further assure long life for your Grow-Boxes, buy a good outdoor acrylic paint, and paint them before filling them. Paint all sides, including the bottom. Good paint, in my opinion, looks better than stain, and will give better protection than almost anything else of which I am aware.
Labels: Construction of raised beds