Firstly, I am afraid the spider story is a complete myth so if that is your reason for wanting to grow it the effort will be wasted. Peppermint seed is widely available in stores and on line. Or plants can be obtained from nurseries and garden centres. Peppermint is not fussy. It just needs a well draining mix but at the same time requires constant moisture. In the wild its ancestors grow in damp locations like river margins. If you live somewhere with hot weather it will probably need a semi-shaded spot.

Floral is right, mower.....peppermint plants aren't helpful in repelling much of anything.

However, there is some evidence that the essential oils of peppermint and some citrus are effective for short periods of time.

Most people understand that spiders play a very important role in a healthy ecosystem and don't want to run them out of our yards. But seeing them inside the home on a frequent basis isn't much fun!