All sites now have access to a Backsaver Spade. If you are not familiar with these check them out online. Backsaver is the registered name to search for. They dig and turnover a plot with no effort on the back. They are ideal for smaller areas or raised beds where a mechanical Rotovator or tiller is difficult to use.
Ask yor warden to show you how it works and borrow it next time you are digging on your plot.