Raising earthworms is an easy, profitable hobby or business venture. The worms don't need care on a daily basis and thrive on little; they are also wonderful composters. Learn to raise earthworms for personal use or to sell for profit.
Decide what type of earthworm you'd like to raise. The most popular earthworms for raising are the red worm (smallest worm in size but easiest to raise) and the night crawler (largest worm in size and good fish bait).
Find the earthworms yourself or buy the worms from a reputable dealer. Red worms are usually purchased from a worm dealer as young worms and eggs. Night crawlers can be found after dark on the edge of lawns and are especially plentiful after rain.
Prepare a place to raise your earthworms. Use a large tub with drainage indoors. For the outdoors, cut the bottom out of the large tub and bury part of the tub in the ground. The tub will keep the earthworms contained and keep animals from disturbing them.
Keep the worms damp and in darkness where they thrive. Provide organic matter like leaves, grass, manure, kitchen scraps and compost material for food. Place this material on top of the worms in the tub; they will crawl up to feed and then burrow down into the dirt when they are finished.
Feed the earthworms once a week. Give one pound of food per cubic foot of space per month. If feeding weekly, divide the amount of food into fourths. Moisten the soil with every feeding and be careful not to add so much water that it puddles. Worms can drown in standing water.
Cover the tub where your earthworms live to keep the moisture inside the container. Ensure that the temperature is consistently between 60 and 65 degrees F, as this is the temperature range in which worms thrive.