I've found weed block to be ineffective and it eventually gets exposed and ragged. For me it would be round up in a 2 gallon pump sprayer. I walk the beds once a week or so. A gallon of concentrate lasts me a couple of seasons. I would have zero concern about the round up affecting future plantings including any vegetables that I would eat. The veggies you eat from the store and at a restaurant were grown with similar herbicides. It's not that I think they are harmless. It's that I think the alternative to using herbicides is worse.