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How To Raise Mealworms

Everyone who has a small flock of chickens should raise mealworms, not because chickens need them, but because they love them.
  1. Gallo del Cielo
    How to raise mealworms (Tenebrio molitor)

    Everyone who has a small flock of chickens should raise mealworms, not because they need them, but because they love them. It's very easy to do and once set up they are virtually maintenance-free and very inexpensive. I give my girls a hand-full or so a day; they think fresh mealworms are the best treat in the world.

    1. You need a container; I prefer 10 gallon aquaria. They allow you to see the condition of the substrate and the glass keeps them from climbing out. You can also use a plastic tub. Keep in mind that it is better to have greater surface area than depth. Never cover it with anything that restricts airflow, especially if you live in a humid environment; but a wire cover is good to keep the lizards, geckos and mice from eating everything if you keep it outside.

    2. Add about 3" of wheat bran to the bottom of the container. I get mine at grocery stores that sell food in bulk bins, but you can also get it at feed stores. You should get it for $1/lb or less (buy about 4-5 lbs to start). You can also use chicken feed, provided it does not have diatomaceous earth (DE) added. I would highly recommend freezing any grain product for a couple of weeks or heating it to 130 degrees for 15 minutes prior to adding it to your colony to limit unwanted pests.

    3. Add some mealworms, the more the better and the faster the start-up will be. I recommend starting with at least 1000 for a container the size of a 10 gal. aquarium.

    4. Add some vegetable matter. I use potatoes, carrots, apple peals, celery stumps, watermelon rinds, whatever kinds of scraps are available. Feed them as often as you'd like. The more you feed them, the more they multiply. Strive to provide consistent access to vegetables for the best productivity. You don't want it to ever get wet inside, the wheat bran must remain dry. Most colony failures are a consequence of excess moisture, which can spark outbreaks of fungus and mites. I live in one of the driest places in the world and I never add moisture beyond that contained within vegetable matter--and I also avoid adding high water content vegetables. The more varied the diet, the better the worms are as food. Be observant when adding new foods and immediately remove anything that they won't eat to avoid rot.

    5. Keep your colony in the shade, outside heat (even in Arizona) is great for them but direct sun or rain will kill them. The warmer they are kept, the faster they develop. They must be brought inside for the winter as their development will slow considerably and they will die in a freeze.

    6. When the wheat bran particles start looking smaller and the layer gets thinner, add more (just dump it over everything). I add more a few times a year. I only clean up the dried vegetable matter that builds up, more rarely the bran.

    7. Wait a couple months after setting up your colony before you begin using worms for food. Use only the larvae (worms) to feed your birds. The pupae and beetles should be left alone for reproductive purposes. There is no need to remove dead animals, old carcasses will be consumed by successive generations. You can collect worms when you add new food. For example, cut a potato in half, put the cut side down and wait 10 min. or so. The larvae will grip on with their mouths and you just lift them up and shake them into a container. Remember, they are harmless and don't bite.

    8. Some people separate beetles, pupae and larvae--I don't, mostly because production is fine for me without the extra effort. If you provide adequate resources for the colony, cannibalism is very low. However, separating them is a good way to observe development--which is very interesting.

    9. Because reproductive and developmental rates are higher with greater temperatures you'll often have more worms in the summer than winter. You can extend the summer glut of worms by packing them in fresh bran and storing them in the refrigerator for later use.

    With prolonged or frequent exposure to mealworms, some individuals will develop severe allergies to them. I highly recommend wearing a mask while tending to your colony and be observant of any respiratory changes you might experience while working with it. A word of caution:

    This colony has been in continuous operation for several decades; I have been caring for it since 1987.


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  1. gagirl02
    I have some black worms in my container. Are these dead worms? If so, can I feed them to my chickens?
  2. 4paws
    I've been itching to start raising these for a while, and I would love to do it outside or my screened porch, BUT, I'm in Florida and am concerned that the summer humidity would be a problem. Thoughts, please?
    I like that you do it in one container rather than dividing them as I've seen most do.
  3. YborChix
    We do ours with oatmeal and some chick feed. Originally we followed instructions that say they need moisture from fruits or veggies but even a somewhat dry piece of carrot almost always started mold in the oats and the mold is your enemy. Perhaps for us it is the Florida humidity. If you get it (mold) throw out the whole batch because it's not savable. We use 1 gallon ice cream containers and fill the lids with safety pin size holes.This keeps other small bugs from getting in. Then we toss them in a dark spot and forget about them. Once we stopped worrying about giving them moisture, we had success. (hopefully a good tip for those of you in humid places) Please follow our Instagram and like our facebook.com/edenconservatory
  4. Big Cluck
    I had a high school science teacher that raise them in the class to feed to the other critters he kept. It really is as easy as the instructions above. My daughters and I started our colony today after our girls went through a 7 dollar bag of dried meal worms in under 2 weeks. It cost 13 dollars to get started as I had an empty 10gallon tank. 3 dollars for the wheat bran and 9.99 for 500 worms at the pet store. My kids had a great time getting it set up and keep asking to pet the worms! So excited to tell their daddy they had 500 new pets!! Does anyone know if placing them on a tray in the sun for an day or so would be an effective way to dry them out/preserve them for later use?
  5. birdldy9
    What could I use instead of wheat bran?
  6. Wonderwend
    A thorough and informative guide - brilliant!! Thanks so much for posting :)
  7. Gallo del Cielo
    @BoiseWiseguy , it sounds like you're doing everything right! What are you using for substrate? It always seems to take forever to see those first worms from the second generation. Under your conditions you should see very tiny worms about two months after the first beetles appeared. Take a handful of substrate and spread it out onto a sheet of paper and look closely to see if they are there.
  8. BoiseWiseguy
    Question - I've ordered 1000 worms, have them in an open topped container with a infrared heat lamp keeping them between 80-90 degrees. I've had them now for about 2 months. Recently I've seen a ton of beetles in the container, and no worms. The worms are for the most part gone. I'm putting in apple slices and lettuce, and replacing them when they get eaten or dried up. Am I doing anything wrong? Where are all the worms?
  9. Gallo del Cielo
    @snowflake , Thanks! It is as easy or involved as you want to make it. Good luck!
  10. snowflake
    very nice thread, sure looks easy, and thank you for the allergy warning.:)

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