James, you have overlooked some of the benefits here. For anyone who is handicapped, raised bed gardening is a necessity. Only attention should be paid to ensure they are no nonger twice the distance of which you can reach and they should be made, as in your case, in rough wood to prevent snails and slugs from climbing in. You will then never need to walk on them thus they will not need digging. Any vegetables can be planted much closer together as you wont need space to walk in between. The PH can be controlled much more accurately. In England, we had thirty square metres of veggie garden and had ample crops.