Medwyn Williams is bowled over by heritage runner beans
Spent growbags that had tomatoes or other crops in this year needn’t be wasted. If the crops had anything wrong with them that was soil-based, you must discard the compost in the general rubbish. However, if the compost is clean of pests and diseases it’s a good bulk ingredient for your compost heap, or can also be deposited onto borders as a mulch. It’ll have few nutrients in it now, but will still serve as useful organic matter.