How to Help Garden Birds in a Heatwave: Water First

Why this is urgent

A garden bird in this heat is under considerably more pressure than any of your plants. It can't move somewhere cooler, it can't wait for the weather to break, and it can't survive long without water. In extreme heat, a wild bird may die of dehydration within a matter of hours, not days, particularly the smaller species. Puddles, streams and ordinary garden water sources dry up fast in a serious dry spell, and finding fresh water becomes a genuine daily crisis for wildlife that most of us won't see happening in front of us.

That's why bird care is a properly urgent job in a heatwave, in a way that lawn care simply isn't. And you don't need a garden to help. A saucer on a balcony, a shallow dish on a windowsill, a small bowl on a courtyard flagstone: all of these matter right now.

Water matters more than food

The single most useful thing you can do for garden birds this week is put out fresh water. Not fancy bird food, not a bird table, not an expensive feeder. Just water.

The rules are simple, and they're the same whether you've got a proper bird bath or a repurposed plant saucer:

• Use fresh tap water. Not rainwater from a butt (which can grow bacteria in warm weather), not water that's been sitting around.
• Change it every single day through a heatwave. Warm, still water becomes a bacterial soup within hours; birds drinking from it can pick up infections they wouldn't otherwise.
• Keep it shallow. No more than 2-3cm deep, so smaller birds can wade in to drink and bathe safely without risk of drowning. A shallow terracotta saucer, an old plate, a plastic tray: any of these work.
• Give it a rough surface if you can. A stone or two placed in the water gives birds something to grip and helps insects escape if they fall in.
• Position it away from cover. Bird bathing makes them vulnerable to cats, so put water somewhere they can spot approaching danger. Not right next to a bush a cat can hide in.
• Put out more than one dish if you can. Different species prefer different heights: ground-level for blackbirds and thrushes, raised for tits and sparrows.

Clean the container properly once a week: hot soapy water, then a mild disinfectant (a diluted bleach solution works, or a specialist bird-safe cleaner), rinsed thoroughly and dried. Weekly cleaning matters more in a heatwave than it does in cooler weather, since heat accelerates every kind of microbial growth.

What the RSPB now says about feeding

Bird-feeding advice has genuinely changed. In 2026, following a 67% decline in greenfinch numbers since 1979, the RSPB updated its official guidance on what to put out and when. Most people won't have caught this yet.

The key change: pause seeds and peanuts between 1 May and 31 October. These are the foods most linked to the spread of trichomonosis, a parasitic disease affecting the throat and gullet of seed-eating finches, which is the primary driver of the greenfinch collapse.

Between May and October, the RSPB now recommends:

• Do put out, in small amounts: mealworms (soaked in water in dry weather), suet, and fatballs. Animal protein helps chick survival through the breeding season, and these foods carry a lower disease risk than seeds.
• Don't put out, until 1 November: seeds, seed mixes, peanuts.
• Retire any bird table or flat-surfaced feeder. Recent research confirmed a higher disease risk on flat surfaces where contaminated food collects. Hanging feeders with small ports or mesh are safer.
• Grow plants that support wildlife directly. Sunflowers, teasels and ivy provide natural seed and attract insects that birds can eat. This matters more than any commercial feed for supporting garden birds long-term.

Come 1 November, seed feeders can go back out for the winter, when natural food is scarcer and disease risk lower.

Feeder hygiene matters more in heat

Regardless of what you're putting out, hygiene has become the single most important factor in whether garden feeding helps birds or harms them. Warm weather makes this worse, not better.

Clean feeders at least once a week with hot soapy water, followed by a non-toxic disinfectant (mild bleach solution or a specialist bird-safe product), then rinse and dry thoroughly. Move feeders to a different spot in the garden every few weeks if you can, so droppings and dropped food don't accumulate underneath.

If you see a sick-looking bird at your feeder — puffed up, slow, struggling to swallow — take feeders down for a couple of weeks, clean them thoroughly, and let birds disperse. Concentrating them at a single food source when disease is present makes the problem dramatically worse.

Small spaces: how to help without a garden

If you're reading this without a garden, you can still genuinely help. A flat, a balcony, a windowsill: all of these can host something useful for local birds right now.

• A shallow dish of water on a balcony floor, a windowsill, or a flat roof, changed daily. This is the single highest-impact thing you can do. Position it somewhere safe from your own cat if you have one, and where local cats can't ambush from cover.
• A small hanging feeder with suet or fatballs (not seed) attached to a balcony rail, a wall bracket, or a strong hook. Position it where you can watch it from indoors and where droppings won't cause problems for neighbours below.
• Bird-friendly plants in pots. A pot of nasturtiums, sunflowers or a small ivy against a wall provides insects, seeds and shelter without needing an ounce of soil. See the container growing fundamentals guide for what actually thrives in a pot.
• Don't overdo it. Small amounts of food, regularly cleaned setups, and a genuine focus on water rather than seed is the best contribution most small-space growers can make.

The biggest small-space contribution honestly isn't feed at all: it's fresh, clean, shallow water, put out every day of a heatwave.

Common mistakes

• Leaving water out for days. Warm, still water grows bacteria within hours. Change it daily in this weather, weekly is not enough.
• Filling seed feeders in summer. The 2026 RSPB advice is clear: pause seeds and peanuts through summer to reduce disease spread. Mealworms and fat are the summer alternatives.
• Using rainwater from a butt. Rainwater can carry organisms that are safe on plants but risky for birds to drink, particularly if it's been sitting warm and still. Use tap water instead.
• Putting water right next to a hedge or dense shrub. Birds bathing are especially vulnerable to ambush. Water needs some open ground around it so approaching threats can be seen.
• Deep water for small birds. A dish more than 2-3cm deep is a genuine drowning risk for smaller species. Shallow is essential, and a stone in the middle helps.
• Keeping flat bird tables. These were standard equipment for decades but current research links them to disease spread. Hanging feeders with small ports are considerably safer.

What to grow for birds in a small space

If you'd like to move beyond feeding altogether — which is genuinely the direction the RSPB is pointing — a few pot-friendly plants provide food, shelter and insect habitat for garden birds:

• Sunflowers. Even a single sunflower in a large pot produces seeds that birds will strip through autumn.
• Ivy. Grown up a wall or trellis in a pot, ivy provides shelter, nesting sites, and late berries that support birds through winter.
• Teasel. A biennial that self-seeds; its distinctive seed heads are a favourite of goldfinches.
• Native shrubs in a large container. A single dwarf hawthorn, holly or pyracantha in a big pot supports considerably more wildlife than any feeder.
• Any flowering plants. Insects feed birds, and flowers feed insects. A small window box of nasturtiums, lavender or salvias contributes to the food chain in a way no bag of seed can match.

Growing for birds is a slower, quieter contribution than filling a feeder — and, according to current research, a considerably more effective one.

Further reading

• Container growing fundamentals
• How to water your plants properly
• Why trees are dying in this heatwave