Providing food for garden birds is one of the most popular ways to connect with nature in the UK. However, the types of food we provide must shift with the seasons, and poor hygiene at feeding stations is currently contributing to a devastating disease epidemic among British finches.
Choosing the Right Bird Food
Avoid cheap “mixed grain” bags found in supermarkets, as these are often padded out with wheat, barley, or dried lentilsโfoods only pigeons and doves will eat, leaving the rest to rot on the floor.
- Sunflower Hearts: The gold standard. They are high in calories, leave zero mess (as the husks have been removed), and are devoured by Tits, Finches, Robins, and Blackbirds.
- Nyjer Seeds: Tiny, black, oil-rich seeds heavily favoured by Goldfinches and Siskins. They require a specific micro-mesh feeder.
- Peanuts: High in essential fats. Crucial Note: Peanuts must be bought from reputable suppliers to guarantee they are free from aflatoxin (a deadly fungal toxin). They must always be served in a rigid wire mesh feeder so birds can only peck off small chunks. A whole peanut is a severe choking hazard for a chick.
- Fat Balls and Suet Blocks: Essential high-energy fuel during the freezing winter months. Always remove them from nylon mesh nets, as birds can easily tangle their feet and die. Place them in a wire cage feeder instead.
Summer vs. Winter Feeding
The RSPB encourages year-round feeding, but the menu should change.
- Winter: Focus entirely on high-fat, high-energy foods (suet, fat balls, sunflower/peanut chips) to help them survive freezing night temperatures.
- Summer/Spring: Avoid homemade fat balls, as the fat will melt in the sun, go rancid, and smear onto feathers, ruining their waterproofing. Focus on protein-rich seeds while they raise young.
The Crisis: Trichomonosis & Hygiene
Between 2011 and 2021, the UK Greenfinch population crashed by over 60%, and the Chaffinch by nearly 40%. The primary culprit is Trichomonosis, a deadly parasitic disease that causes severe lesions in the bird’s throat, leading to starvation.
The parasite spreads through contaminated food and droppings. Because bird feeders artificially congregate dozens of birds into a tiny space, dirty feeders act as super-spreaders.
RSPB Hygiene Protocols (2026 Recommendations):
- Ditch the Flat Tables: The RSPB has suspended the sale of flat bird tables and tray feeders. Damp food sitting on flat surfaces heavily promotes the transmission of the parasite. Prioritize hanging tube feeders instead.
- Weekly Scrubbing: Feeders must be dismantled and scrubbed with a mild 5% bleach solution or specialized veterinary disinfectant at least once a week. Rinse thoroughly and dry completely before refilling.
- Move the Feeders: Do not leave the feeding pole in the exact same patch of grass all year. Rotate it around the garden to prevent a toxic buildup of feces and husks on the lawn below.
- Stop at the First Sign of Illness: If you see a lethargic bird sitting fluffed up near a feeder, visibly struggling to swallow, or droolingโstop feeding immediately. Take down all feeders, empty them, disinfect them, and wait at least 3 to 4 weeks before putting them back up to force the infected flock to disperse.
Reviewed by Dr. Sarah Jenkins, MRCVS
Dr. Jenkins is a fully practicing veterinary surgeon in the UK with over 15 years of clinical experience in small animal medicine and canine behaviour. She reviews and verifies our health content to ensure medical accuracy.
