Powdered mulberry food is a "just add water" mix that can be cooked up in the microwave in 5 minutes, available in ¼lb, ½lb, and 10lb bags. All dry food comes with detailed cooking instructions. Once the silkworm food is ready to feed, a thin layer of Silkworm food is grated over the top of the worms. The silkworms will immediately crawl to the top and chow down on the food. Food will stay fresh for a month in the refrigerator after cooking up. See care products for our silkworm food graders.