Walking or riding the "hedge" would mean standing on that boundary, or with one foot here and one foot there. When that boundary also includes the line between Life and Death, that can be an uncanny and dangerous place. Which is, of course, the world of the shaman, nightrider, hedgewalker.
Since geese (especially snow geese) are often associated with this sort of nightflight, Otherworldly travel...I want to do more research on geese and see where it leads me. Mother Goose, obviously. Certainly, I could see Mother Goose as the local wisewoman, cunning woman, storyteller and healer, old granny around the village.