Sanctuary forest in the Mattole valley does an annual series of hikes Spring to Autumn, one being edible /
medicinal plant hike that happens around May.
"Sanctuary Forest is a land and water trust whose mission is to conserve the Mattole River watershed and surrounding areas for wildlife habitat and aesthetic, spiritual, and intrinsic values in cooperation with our diverse community."
The Woman who guides it is very knowledgeable.
It has already happened for 2023, maybe you can attend in 2024
Here is a link
https://sanctuaryforest.org/event/edible-medicinal-plants-hike-2023/
Best Wishes