Mung Bean seeds for sprouting. Mung bean seeds will grow to 4 times their size during the sprouting process. Mung bean's are the most widely eaten seed on the planet. This is the Beansprout that goes into so many Asian dishes. They are so easy to sprout and can be eaten in just two days into the sprouting. To get them to resemble the "Beansprout" keep them in the dark and grow for 5 plus days.