It can be made of wheat bran, corn meal or dry oatmeal. If the culture s bedding becomes dusty and worn down in appearance, add more bedding. Food such as a piece of raw potato, carrot or celery is essential to provide the mealworms with moisture. They can also be fed ground dry cat or dog food. Unless you re queasy, you harvest them by simply picking them out of the medium.
Mealworms are a healthy food for many birds and mammals as well.