What good growing on our patch: beatroot, onion, cucambers, courgettes, carrot, corn, cabbage (any kind), potato, beans, even tomatoes (you just need to treat them regularly and start treatment early, some crops can be saved), kohlrabi… had difficulties with aubergine and peppers, but one small type of aubergine was successful.
Some people buy manure (u can order in the shop on site) and spread it all over the plot. We did once like that and had so much weed, so since then we feed plants only, not all over the patch.
The best practice for us is to pay some money to plough the patch with the tractor. We clean the grass and one of our managers comes on the tractor and turns the ground. Grow your own plant from seeds, it is cheaper and you know what you are growing. Trim the trees if you can to keep their branches at bay. I dont do it ‘professionally’, i just work on the plot because love and enjoy the proccess very much))