I don't know but it does sound interesting because on another post I read it said not to put worms in containers.

Searching the internet, I have found several talking about the benefits of introducing worms.

From what I have read, it is mostly all good. I wish I had thought of it sooner actually.

For one thing, worm excrement, better known as the worm's 'castings', adds natural nutrients into the soil.

There is a downside. Which could very well be the reason for advising against it. It is this: when worms run out of organic material to eat, they will go for the roots next apparently. This has to be corrected by adding decayed fruit and vegetables to the pot and then all 'might' be well. Worms tend to do what they want and not what you always hope they will do. Which leads to:

Another reason against it is that there is a risk the worms will reproduce too much and instead of a pepper farm, you'll have a fishing bait shop. Worms are difficult to cull. Once they are in, they are in.

On the whole, I think it is a simple and natural way to get nutrients into the soil. Not only that, they aerate the soil, eat any kind of root fungus and keep the soil in a condition beneficial to the plant. The positives out-weigh the risks in my opinion.

A lot people inadvertantly have earthworms in pots, overlooking them in the soil when they are replanting. If you use the soil from your outside garden to pot with, there is certainly every chance an earthworm might come along. They aren't always readily visible. Small earthworms can easy slip through a wide enough guage soil sieve if you taken the time to do even that.

well I will do try it in a few pots next year