Goldfinches have increased substantially in UK gardens, benefiting from niger seed and teasel, demonstrating how garden habitat management directly improves individual welfare.
Goldfinch welfare in winter is significantly improved by garden bird feeding. Niger seed feeders provide high-energy food that allows more individuals to overwinter successfully than in landscapes without supplementary feeding. Teasel plants in gardens provide natural food while eliminating competition and dependence on feeders. The strong correlation between niger seed feeding adoption and goldfinch population increase demonstrates the direct welfare benefit at population scale of garden feeding practices. Individual goldfinch welfare during cold spells depends on access to high-energy food sources, which garden feeding reliably provides.