Niger seeds come from the teasel flower heads. So beloved of goldfinches, siskins and in some locations, blue tits. You will need a dedicated niger feeder as the seeds are fine that they will blow out of a conventional bird feeder and readily germinate whenever they come into contact with soil. We have heard of 50+ goldfinches in one garden feeding off of these tiny seeds! Incredible. An alternative to niger seeds are sunflower hearts for attracting goldfinches. Beautiful birds and in large numbers in-and-around the Nantwich area - we love them.