Worms like air but not too much light. Keep your worm bin in shade. If you use clear containers to make your worm farm, throw a cover over it. They like a moist environment so water occasionally. Add food scraps regularly. After a few months, the vermicast is ready to put on the garden. You can then make a new bed for your worms and build up more layers - see www.environmentcentre.org.nz for more information on how to do this.