I own a small scale grower / retailer selling just plants and very little else. My wife talked me into starting coffee & cake some years back. It was a great success for local people who would cycle a few miles then stop for coffee and cake and spend an hour or more sitting chatting. Most of the time people don’t even walk round the plants! With the cost of the equipment to set this up, coffee machine, tables, chairs etc & the time taken to attend to these people it was never going to give a ROI. It's a pet hate of mine when new people turn up at lunch time expecting us to serve a Sunday roast, I politely direct them to a restaurant/pub for that service – After all, the clue is in the name "GARDEN" centre..... We actually have a strong solid returning customer base and many have said they come because we don't have all that stuff