Once you have decided to create a raised bed it is important to take some time to plan its ideal positioning.
Ideally, the raised bed should be positioned running in a north-south direction to ensure optimal use of sunlight.
Fill the raised bed in layers - firstly with small sticks and twigs, secondly chopped shrub and/or tree clippings, thirdly a layer of green cuttings, foliage and compost and finally garden/potting soil and/or topsoil.
Do not fill the raised bed with sand.
Information online often suggests that raised beds are not suitable for plants which require a lot of space to grow, however, as I see it, no plant needs more space than in the ground and therefore practically every plant is also suitable for a raised bed - with perhaps the exception of trees (although planting trees in raised beds is not usually something a gardener wants to do anyway!).
Mice and voles are fond of using raised beds as a source of shelter. It is therefore essential to place close-meshed wire netting, for example chicken wire, on the ground.
Zucchini (courgette) is easy to grow and produces a large yield. All it needs is a sufficient amount of water.
Caution: never eat bitter-tasting zucchini.