I’ve only ever seen goldfinches feeding on burdock seeds (Arctium) in the garden before. This morning I saw them both on nettle seed heads and then on these unharvested chicory heads. Another reason to grow and save seed of chicories, a wonderful vegetable that is easy to grow organically, comes in many great edimental varieties, beautiful flowers in the second year, both leafy green, root vegetable and coffee replacement varieties available, some being perennial as is the wild plant and can be forced in winter! See more in my book Around the world in 80 plants!