Teasel

The seeds are an important winter food resource for some birds, notably the European Goldfinch. Teasels are often grown in gardens and encouraged on some nature reserves to attract them.
Teasel is also considered an invasive species in the United States. It is known to form a monoculture, capable of crowding out all native plant species, and therefore is discouraged and/or eliminated within restored open lands and other conservation areas.