How do you make a mini worm farm?

Find or build a wooden box. Add top soil mixed with worm bedding. Catch a few night crawlers in the evening after watering, or buy a dozen or 2 at a bait shop. Place the worms in your dirt filled box. Add coffee grounds to the mixture once a week. Keep the box in a cool place. Keep the dirt moist. Move the dirt around every 2 or 3 days.