Dandelion greens are a healthy additive to salads, and cooked like spinach. The flowers make a 'wine'.
Look at recipes on the net.
When I was a child, we had a 'crazy' lady as a friend. She had a large yard, and when the dandelions bloomed, my grandmother and I would help her collect the flowere to make wine. We always had a supply in our pantry.

Calgary has stopped spraying. Here, next to the Foothills, they are a part of the natural succession in meadows and fields.