A really strong site for harvesting wild edibles is FeralKevin.
Ive been watching his channel for a good two years now,
and learned quite a bit from his work.
He encourages his friends and clients to plant wild edibles
in their own back yard too...MAKES PERFECT SENSE.
Here's a great vid from him...def subscribe and enjoy.
Nettle juice!!! POWER!!!
Here's his direct site - http://feralkevin.com/