Worm tower in a raised bed

Three raised bed edges
Work in progress. Untreated wooden raised bed

The start of a new experiment in the garden; a three tier raised bed with a worm composting space at the top. The design is a cross between a keyhole bed (a bed with discarded green and brown waste I. The centre), vertical gardening (making the most of space by building up) and a worm tower ( a pot of compost and worms with holes sunk in the bed).