Posted: 15/10/2013 at 10:14
I once bought a wooden trough, unlined, with a trellis up the back of it. It had been treated, but after about 10 years rotted and fell apart. The Nelly Moser clematis that was in it has now been transplanted to another pot.
Another thing about the wooden trough was that it was made of planks of wood, a bit like narrow decking planks, and it was very leaky, it was hard keeping it damp enough, when watered the water leaked out between the planks and leaked a lot out of the bottom.
Size depends on what you want to grow in it. A few bedding plants can manage in a smaller pot than a clematis. As Mac the Cat says wooden pots are very heavy. Ideal price is what you can afford. What it looks like depends on your personal taste. If you are making it yourself then a square one would be easiest.