We copy what the larger growers do and use the biodegradable Lightweight Cornstarch Film for our pumpkin patch. It can be rolled out by hand as well as machine laid and the results each season are so satisfying. The film maintains its mulching efficacy for no less than four - six months and no more than nine - twelve months, depending on moisture, soil activity and other variables. But what we can say for sure, is that this film works perfectly for growing pumpkins!