Mini worm farm advice and help?

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Locomotiv Club_Bologna

Question by TravelingGal: Mini worm farm advice and help?
We want to make a very small worm farm. However, can;t seem to find information as far as how often we need to change the dirt and how many square foot as not to exceed. And, how fast do they multiply?

We will be using the worms for the wild birds, fishing and the garden.
Soory, that’s confusing. How many worms per square foot?

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