Have dug in the sheet composted coffee grounds and grass clippings. I think it makes a better veggie bed combining the organic matter with the topsoil although no-dig purists may disapprove. Have planted out a lot of self sown corn and lettuce seedlings and mixed the corn with broad beans. Need to add squash for the Mexican triumvirate. The whole site is covered in weeds now and we are finally getting some mandarins, lemons, limes and oranges.