Posted: 24/07/2016 at 12:23
Get some ready bagged well-rotted farmyard manure from a garden centre, spread it on top and dig it in to the depth of a garden fork. You need at least a 2 inch layer to do any good and preferably 4". This will improve the soil structure and add lots of nutrients. If you spread another 2" over the bed each late autumn, the worms will do the work for you so no further digging required. This is called winter mulching and will also help keep weeds down. After a few years of doing this you will have superb soil in which you can grow just about anything.