Before modern times many people did not venture out of town very often, and if they did they seldom did it at night. The edge of town was often marked with a hedge signifying the end of civilization and beyond that was the wild and unknown. In Eric de Vries book (below) he describes how the word Hedgerider has its roots in an old Norse work Hagzissa but also in Old English Haegtess. Which means Hedgerider. It is the same concept as "Parting the Mists" only the imagery of the Hedge and the edge of town is used instead of a mystical mist. One would ride the hedge by going into a trance, or what we call journey work today. This is crossing the boundary from this world into the other, which is wild and unknown!
Hedge Witches tend to be solitary and work most of their magic on this plane with herbs, plants, and flowers. Many Witches that work in the kitchen adopt this term rather than Kitchen Witch. They find much of their practice in Folk Magic and in Nature. Their roots are in Wicca or tend to lean in that direction, working with specific colors, herbs, magic of the home. Many times this is called Green Craft or Green Witchcraft. Hedge Witches pull much of their practice from modern sources backing up their herbal knowledge with modern medicine and science, when it comes to healing. They also work charms and spells but they tend to be of a different nature, and use things like crystals, and herbs.
To learn more about becoming a Hedgerider visit this link and read this book
To learn more about becoming a Hedge Witch visit this link and read these books