This name gives a good indication where many of them are found around Otley, but it's also known as Poor Man's Mustard. Its edible leaves can even be found and eaten in the winter, as they contain a natural antifreeze. It is biennial, and its first year leaves are a completely different shape (rosette-like) to the second year's (serrated edges, as in the photo taken today).
JACK BY THE HEDGE
Updated: Dec 9, 2020