01 / CONTAINER
Give them room
Use a smooth-sided plastic bin or tray with a secure, ventilated lid. Keep it out of direct sun and away from areas that overheat.
A beginner's field guide
Raise mealworms with confidence.
A simple, practical guide to setting up a colony, keeping it healthy, and understanding what happens from tiny egg to darkling beetle.
Build your first colony ↗
01 / The setup
Start small. Keep it dry.
You don't need an elaborate farm. A ventilated container, dry grain-based bedding, and small pieces of produce provide a straightforward starting point.
02 / BEDDING + FOOD
Add dry substrate
Put a layer of wheat bran or oats in the container. Mealworms live in it and eat it. Replenish when it becomes depleted or heavily soiled.
03 / MOISTURE
Offer a small slice
Add a piece of carrot or potato for moisture. Replace it before it spoils; remove anything moldy promptly. Avoid open water dishes and wet bedding.
02 / Know what you're seeing
Four stages, one colony.
A mealworm is the larval stage of the darkling beetle Tenebrio molitor. Growth speed changes with temperature, food, and other conditions, so expect variation.
01Egg
Small eggs begin the next generation.
02Larva
The familiar mealworm grows and molts.
03Pupa
A pale, mostly still stage before adulthood.
04Beetle
Adults mature, mate, and lay eggs.
03 / The routine
A few minutes of care.
A steady routine matters more than a complicated setup. Start with one colony and adjust as you learn how it behaves in your home.
OftenCheck produce, remove spoiled pieces, and look for condensation or mold.
WeeklyTop up dry food as needed and remove dead insects or obvious debris.
As neededSeparate pupae or beetles into their own containers if you want a more controlled breeding cycle. Refresh dirty substrate carefully; tiny eggs and larvae may be mixed in.
04 / Quick answers
Common questions
Do mealworms need a water dish?
No. Small pieces of carrot, potato, or similar produce can supply moisture. Remove leftovers before they rot and keep the bedding dry.
Why are my mealworms turning white?
A pale, soft-looking larva may have just molted. Its outer covering darkens as it hardens. A pupa looks different: it is curled and does not crawl like a larva.
Why aren't they growing quickly?
Development varies with temperature, available food, moisture, and crowding. Check for stale substrate and spoiled produce, and avoid extremes of heat and cold.
Should I separate pupae from larvae and beetles?
It is useful when breeding: a separate pupa tray makes it easier to move emerging beetles into a breeder container and manage generations. A simple mixed colony can still be a starting point.
Watch and learn
See the colony in action.
Mealworm World on YouTube
Videos coming soonSetup walkthroughs, colony updates, and practical care demonstrations.