According to this article the number of goldfinches increased by 78% last year. The increase is largely being put down to the fact that people are starting to put out a new bird seed mix on their bird tables. The mix of nyjer seeds and sunflowers seeds seems to be increasingly popular with people who feed the birds. Luckily for goldfinches the mix is their food of choice as it is very similar to what they eat in the wild. It appears that this new food source has boosted the population and has also led to more sightings of goldfinches at garden bird tables. Based on this I might get some of this seed for the goldfinches in my garden or perhaps I might plant some sunflowers to encourage more of them to visit.