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 Posts8 Tricks For Growing Fabulous Onions #Gardening#Gardening : Tips For Growing Perfect Tomatoes#Gardening With Epsom SaltGrowing Potatoes In Bags #Vegetable_Gardening