How to Increase the Size of Mealworms

Mealworms, an important food source for insect-eating birds and reptiles, will eventually develop into beetles when left to their own devices. For this reason, pet stores often store the larva in refrigeration units to force them into a dormant state. Larger pets require larger mealworms, but commercially sold "giant" mealworms may contain growth hormone. For naturally larger mealworms, you can store them in a warm place and offer extra moisture sources.

Things You'll Need

  • Rolled oats
  • Plastic container with large surface area
  • Carrots
  • Sifter
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Instructions

    • 1

      Pour 1 1/2 to 2 inches of rolled oats in the bottom of a shallow plastic container. Mealworms eat oats, and the nutritious grain makes mealworms healthier for animals that eat mealworms.

    • 2

      Add a few carrot slices to provide moisture to the mealworms. Moisture will make the mealworms fatter.

    • 3

      Place the mealworms into the container, leaving 1 inch or more of space at the top. If you wish to use a lid, choose a well-ventilated lid to prevent condensation and allow the worms to breath. Since mealworms can't crawl out of the container, a lid is not necessary.

    • 4

      Store the mealworms in a warm area, preferably 80 degrees, out of direct sunlight. A warm place will encourage worm growth.

    • 5

      Sift dross, or mealworm waste, out of the bedding whenever you notice an ammonia odor.

    • 6

      Place your mealworms in a refrigerator when they reach the desired size to prevent them from transforming into beetles. You will need to remove the larvae once a week for several hours so they can eat. Continue to provide carrot slices and oats.