Using garlic to protect other plants

Garden Experts
Dear Mr. Kötter, in your last mail notification, it said that you can plant garlic (cloves?) into plant soil to protect plants from infestation. Do the cloves need to be peeled prior to insertion into the soil? I think this must be so, otherwise the garlic cannot take effect – or does it dissolve into the earth anyway? It would be very kind of you to provide me with an answer to my question.

The GARDENA gardening expert

Dear Ms. V., we treat garlic in the garden just like normal onion sets. The only difference is that you plant garlic cloves not in March/April but in April/May, as the origins are generally sensitive to frost. No, you don't have to peel them. The garlic plant develops from the clove, and the typical bulb with its numerous cloves develops at its base. It is the smell and the root excretions from this bulbous plant which deters aphids & co.