According to the British Trust for Ornithology (BTO), greenfinch numbers are down over 60% since the mid-2000s – a sharp drop that equates to a loss of around two million birds. Trichomonosis is the main culprit, a disease that prevents infected birds from feeding properly.
Greenfinches have now been added to the ‘Red List’, a critical conservation status. It’s not all doom and gloom though, there are things you can do in your garden to help this beleaguered bird this summer.
Grow seed-rich flowers they can feed from naturally
The best finch-friendly garden is one that provides natural food. Think seed-producing plants that can be left standing later in the season, rather than tidied away too soon.
James Ewens, wildlife expert at Green Feathers, says: “A finch’s favourite garden is one that provides natural seeds. Plants like sunflowers, cornflowers, teasels and cosmos are all perfect as they produce seed heads that birds can feed on later in the season.”
Native wildflowers are helpful too, because they do more than produce seed. James adds: “Planting native wildflowers is also important as it helps to create a garden that’s bursting with food and critters that birds also love to munch on.”
Let seed heads stand
A slightly untidy garden can be a lifeline for wildlife. Instead of deadheading everything, leave seed heads in place through late summer and autumn so finches can forage naturally.
“Seed heads are a wonderful, natural food source that many garden visitors rely on, especially finches,” says James. “Leaving them standing through late summer and autumn provides easy access to nutritious seeds for birds, as well as supporting insects and other critters that come into your garden. A slightly untidy garden can be a huge help to wildlife, even if you like things neat and orderly!”
Dick Woods, founder of Finches Friend, also recommends seed heads as a safer natural food source. He says: “Seed heads matter because they are one of the few food sources that are naturally free of the trichomonosis parasite. They offer clean, species-appropriate nutrition, and wherever we can provide them, we absolutely should.”
Leave clover and long-grass islands
If you have a lawn, consider letting some areas grow longer during summer. This creates shelter, encourages insects and allows plants such as clover to flower.
Dick advises: “Add Clover to grass and let it grow. If you have a significant amount of grass, leave islands uncut throughout the summer. Sunflowers are great for providing seeds so if you can set an area aside for wild flowers, the birds will love it.”
This does not mean abandoning the whole garden to wilderness. Even a small un-mown patch or a few longer strips around the edges can help create a more varied habitat.
Make water safer — and keep it clean
Water is especially important in hot, dry weather, but experts differ on the safest way to provide it.
James recommends keeping bird baths scrupulously clean. “A bird bath should be emptied, scrubbed and refilled with fresh water regularly - especially during the summer season - to keep it safe for visiting birds,” he says. “A good scrub with hot water and a stiff brush will remove dirt and algae, then simply rinse through before refilling with fresh water. If the weather gets particularly hot, I’d recommend changing the water every day to keep it clean and inviting.”
Dick, however, advises against traditional bird baths because of disease risk. “We do not recommend using traditional bird baths at all,” he says. “The reason is simple: the trichomonosis parasite can survive in standing water for up to three days, and because it’s spread through saliva and faeces, a bird bath becomes an ideal transmission point.”
As an alternative, Dick suggests creating a simple water ring: place a shallow bowl on the ground, invert a slightly smaller bowl inside it, then fill the outer ring with water. He says: “This creates a clean ring of water that birds can drink from but cannot defecate in.”
Understand why finches need extra help
“Finches, along with all our feathered friends, are busy feeding their hungry chicks throughout spring and summer, and that’s tough work, so they need a helping hand with a reliable source of food and water close by,” says James. “Changes in habitat and periods of hot, dry weather can make it harder for finches to find resources, so a well-stocked feeder and a clean bird bath can make all the difference to local bird families.”
But disease is also a concern. Dick adds: “Finches have been hit especially hard by trichomonosis, a parasitic disease that has exploited the design flaws in many common garden feeding products. The parasite infects the bird’s entire digestive tract, which means both saliva and faeces become infectious.”
Avoid damp seed and stagnant water
If you do use feeders, moisture is the key issue to watch. Wet seed, old food and dirty water can all increase disease risk.
James says: “One of the most common, and easy to make mistakes, is allowing feeders and bird baths to get dirty. Stagnant water, old food debris, and droppings can all increase the risk of disease spreading between the different birds that visit your garden.”
Dick’s advice is more specific: avoid any feeder that allows seed to get wet. “The problem is that the most common feeder in British gardens, the traditional tube feeder unintentionally creates perfect conditions for the parasite,” he says. “Rain enters the feeder, the sun warms the damp seed, and when an infected bird feeds, its saliva contaminates the wet food. The feeder effectively becomes an incubator for the parasite.”
His rule of thumb is simple: “Dry food doesn’t support the parasite, so the risk of transmission drops dramatically.”
You can feed greenfinches without a bird feeder by using flat platform trays, scattering seeds in open areas, or relying on natural foraging in your garden
Reduce crowding
Where birds gather in large numbers, disease can spread more easily. If you do put food out, avoid creating a single busy hotspot.
James advises tackling the problem through “regular cleaning, fresh water, and by staggering your bird feeder to avoid overcrowding!”
You can apply the same principle across the whole garden by spreading resources out: water in one place, seed-rich planting in another, and dense shrubs or hedges nearby for cover.
Think habitat first, feeders second
Feeders can play a role, but the most resilient finch-friendly garden is one that offers food, water and shelter naturally.
James says: “Many gardeners are tempted to pack their feeders away once the long, cold winters are over, thinking the warmer weather automatically means a surplus of food - but that’s not always the case.”
Dick agrees that supplementary feeding is likely to remain part of garden bird care, but argues that it must be done with disease risk in mind. “The key is not to abandon feeding, but to understand how disease transmission works and stop creating the conditions that help the parasite thrive,” he says.
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