Weed Seeds for Birds * Weeds that are favored: Burdock (Arctium minus) Chicory (Cichorium intybus) Crabgrass (Digitaria spp.) Dandelion (Taraxacum spp.) Dock (Rumex elongatus) Groundsel (Senecio vulgaris) Johnsongrass (Sorghum halepense) Knapweed (Centaurea maculosa) Mullein (Verbascum spp.) Pennsylvania Smart Weed (Polygonum pensylvanicum) Pigweed (Amaranthus retroflexus) - strongly favored Plantain (Plantago spp.) Pokeweed (Phytolacca americana) Ragweed (Ambrosia artemisiifolia) Teasel (Dipsacus sylvestris) Thistle (Cirsium spp.) Velvetgrass (Holcus lanatus)   * References used: McKinley, Michael. 2001. Ortho's All About Attracting Birds. The Scotts Company.IA; Vriends, Matthew. 1990. Feeding and Sheltering Backyard Birds. Barron's Educational Series. NY.; Davison, Verne. 1967. Atracting birds: from the Prairies to the Atlantic. Crowell Co, NY.