Life cycle of millipedes
Millipedes spend the winter as adults, hiding in protected locations. Eggs are laid in the soil or under decaying organic matter. Young millipedes that hatch from eggs resemble small, shorter versions of adult millipedes. The immature millipedes grow gradually in size, adding segments and legs as they mature.
Growth and development occurs in damp areas with decaying organic matter. Millipedes can not reproduce indoors. All millipedes found inside wandered in by mistake.
Damage caused by millipedes
Millipedes are harmless; they do not feed upon building structures or furnishings and they cannot bite or sting. However, millipedes can be annoying as accidental invaders in houses and other buildings when they migrate into buildings over night. Millipedes are usually found in the garage, basement or lowest level although they may wander into other parts of the house. Millipedes in greenhouses, gardens and potted plants may be annoying but do not feed on the plants unless the plant is already damaged or decayed.