Hardy perennial version of the common cover crop which famously improves soil and provides edible greens. 
 
Consult with grEnz for further information.

Legal Disclaimer: Customer is SOLELY responsible for knowing how and when to safely (and effectively) consume food from any purportedly edible plants, including but not limited to: a) knowing which parts of the plant are edible, when they are edible, how to harvest them, and how to prepare them for eating palatably and comfortably (*chewability*); b) knowing look-alike plants; c) toxicity concerns; and d) allergy concerns. Customer should be especially careful preparing home-grown edibles for children and for guests and should first gain familiarity feeding themselves.