Earthworms are garden friends
The presence of worms in the soil indicates a good soil condition. Worms do what even agrotechnical techniques are incapable of. They reclaim and structure the soil by eating it. Where there are no worms, the harvest will be bad. Do not help even feeding and fertilizer. Worms love herbs.
The use of chemicals will lead to their death.
You can learn how to cook compost fertilizer in due form.
The benefits of earthworms (video)
How to make more worms
Feed the earth! All that remains of the table, do not throw away, and pour into the soil. Then just dig it. The main thing is to provide worms with nutrition. It is necessary to bring leaves from trees into the soil.
Consider a few more effective ways to attract useful "neighbors".
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You can grow your own California red worms on your own. At the same time for the winter they will have to make a special room so that they do not freeze.
California worms have animal status. This means that if you decide to sell them, you will have to obtain the appropriate permission from the quarantine service. The seller must give you the same permission if you decide to buy worms. Only in this way you will not be deceived and nematodes will not be sold.