Last July we spotted a Goldfinch in our garden eating thistle seeds. He will probably still be spreading them though as a lot of seeds are designed to be passed through a birds digestive system. This dissolves the outer layer of the seed, thus activating the core and growing a new plant. A type of stratification.
https://www.birdwatchireland.ie/IrelandsBirds/Sparrowsfinchesbuntings/Goldfinch/tabid/450/Default.aspx