Live Mealworms - Grow Organically right on our worm farm. These worms are grown on a organic diet of fruits and veggies. They are never refrigerated during the growth process- That means they will last longer. These Meal Worms are the standard size of 3/4" to 1" in length. Will include simple instructions on how to store your meal worms properly. Meal worms can last up to 3 months in refrigerated dormancy.