What to do with your glut of spring greens? And, making oregano oil!

It's mid spring here on the west coast and there is a gorgeous glut of greens everywhere!
In my garden I let the dandelions and wild lettuce grow, but now I want to harvest them to make room for my other seedlings. I'm picking the leaves daily, dehydrating them, grinding them into powder, and storing as greens for smoothies! And when the greens are gone, I'll harvest and dry the roots as well!
But, what I really wanted to talk about was making your own oregano oil!!
Have a huge bush of lemon balm, catnip, spearmint, or oregano? Perfect!