I wouldn't dare as I don't know enough about it although I grew up and live in fairly rural areas. My mother would use mushrooms that grew overnight on the lawn for a fry-up (they were huge and filled the pan)
I think I would try dandelion salad or nettle soup, as I could definitely recognise those.
And maybe use interesting bits of fallen branches for Christmas decorations.
How to celebrate looking after a grandchild
What has survived in your garden with minimal or no watering?
