Under favorable conditions, a worm population can double in number approx. every 60 to 90 days. A mature red worm can produce 2-3 cocoons per week, each hatching about 4 baby worms.
Coffee grounds are organic in matter, which makes it a perfect food source for worms. Yet, too much of a good thing always has the risk of throwing the conditions in your worm bin off kilter. This can hurt your worms. As usual, there are many factors at play.
Worms are perhaps the most important creatures on Earth. There are some worm facts which are quite fascinating. Charles Darwin, best known for his theory of evolution, seemed to think so.