Am planning to build a raised bed at the weekend, over the site of an old pond. The pond has been drained and pretty much filled with rubble, hardcore, stones etc.
My plan is to cement 4 posts in the corners, then nail/screw/coach bolt some planks of wood into the posts, building them up a layer at a time. It's about 6ft x 4ft. Not really sure of what sizes post/planks to go for. Obviously it will be filled with soil so there will be plenty of weight in there, am planning on going up to about 60/70cm high and don't want the wood coming apart/breaking under the weight.