ASPEN TREE- ATTRACTS: Blue Buntings. They will feed on the twigs, buds and leaves. Perfect planted at the border of your property. Perfect for hanging tube feeders, thistle feeders or placing platform feeder or hopper feeders nearby. Fill feeders with chopped nuts, millet, Safflower, Sunflower hearts, cardinal mix, nut and berry wild bird mix and thistle to attract these beautiful songbirds.