Growing Beans In A Plastic Bag #Ideas Edit Place the beans in the sandwich bag with the wet paper towel and seal the bag. The beans will sprout in 3-4 days. Share this post Related Posts10 Hacks To Really Up Your Gardening Game This Spring5 Household Items That Make Perfect Seedling Starters10 Ways To Build A Miniature Garden With Items Found In Your House5 Clever Tips For Creating A Vegetable Garden That Will Last