Why a fortnightly wash matters more than you think

A well-stocked feeder is one of the great small pleasures of a British garden. It also happens to be a busy communal dining table, where dozens of birds stand shoulder to shoulder on the same perches and dip their beaks into the same seed ports. That is exactly how disease spreads. Trichomonosis, which has caused a devastating decline in greenfinches since the mid-2000s, passes from bird to bird on contaminated surfaces and in saliva. Salmonella, which regularly turns up in siskins and chaffinches, is spread through droppings. Avian pox can linger on feeders too.

The good news is that this is one of the easiest problems in wildlife gardening to solve. A thorough wash every fortnight, and a little shuffling of where you hang things, breaks the cycle almost entirely. It takes twenty minutes and a bucket, and it is the single most useful thing you can do for the birds in your patch.

The kit to keep by the back door

Have a small cleaning kit that lives in the shed or by the outdoor tap, so there is no excuse for putting the job off. You will want:

• A stiff bottle brush for tube feeders, plus a small pipe brush or an old toothbrush for seed ports, perches and the fiddly corners of the base plate
• A dedicated bucket or washing-up bowl that never gets used for vegetables or dishes
• Hot water and ordinary washing-up liquid for routine fortnightly cleans
• A disinfectant for use during outbreaks — a diluted household bleach solution of about one part bleach to ten parts water, or a pet-safe disinfectant, both work well
• Rubber gloves, because you are handling droppings and sometimes mouldy seed
• Two sets of feeders, ideally, so one can be soaking while the other is out on the pole

The fortnightly clean, step by step

Pick a dry morning so everything can dry properly in the sun. Damp feeders are almost as bad as dirty ones, because wet seed goes mouldy and mouldy seed causes respiratory problems.

• Take the feeders down and tip any remaining seed into a bag for the bin or a corner of the compost heap. Never put old seed back in the feeder.
• Dismantle as far as the feeder allows: bases, perches, baffles and trays all come apart on most modern designs.
• Soak everything in hot soapy water for ten minutes, then scrub every surface. Pay particular attention to seed ports and the base plate, where damp seed and droppings collect in a paste.
• Rinse thoroughly with hot water. If you have used bleach or disinfectant, rinse at least twice and give the feeder a final swill with clean water.
• Allow to air dry completely — a sunny windowsill, a greenhouse bench or a warm utility room all work well. Do not refill a feeder that is still damp.
• Wash your hands and the bucket, and scrub the brush clean before putting it away.

If you only do one thing beyond the fortnightly wash, make it the drying. Dry feeders stay cleaner for longer and keep seed fresh, which means fewer birds turning their beaks up at it.

Rotating your feeding stations

Here is the bit most gardeners miss. Even with immaculate feeders, the ground underneath them slowly accumulates husks, droppings and spilled seed — a reservoir of infection that birds pick up when they forage below the hanging station. Rotating where you feed solves this neatly.

• Keep two or three hanging points around the garden and move your feeder to a different one each fortnight, leaving the empty spot to rest.
• After moving, rake or sweep up the debris beneath the old position and put it in the bin, not on the border.
• If you use a ground table or tray, shift it onto a fresh patch of lawn every couple of weeks. The grass beneath will recover quickly, and the old patch gets a rest.
• Space feeders out rather than clustering them. Several smaller feeders hung a few metres apart are far better than one large one, because they stop birds crowding and squabbling beak to beak.
• Site feeders where you can see them easily — a little distance from a window, but with a clear view — so you spot a sick bird quickly.

Water, trays and the bits people forget

Bird baths deserve the same treatment. Empty and refill them most days in warm weather, and scrub them once a week with hot soapy water, rinsing well. A bath that has gone green or gritty is a shared drinking fountain for every bird in the neighbourhood.

Do not overlook the supporting cast: seed trays, catch trays, squirrel baffles, the pole itself and the ledge beneath a window feeder. Wash them on the same fortnightly schedule. If you have a mesh feeder, scrub it with a brush, as the mesh holds debris in a way solid feeders do not.

When to take the feeders down altogether

Sometimes the kindest thing is to stop feeding for a while. If you see birds that are fluffed up and lethargic, sitting on the ground when they should be feeding, drooling, or with food stuck to the beak, assume something infectious is circulating. Take every feeder and water container down for at least a fortnight, clean and disinfect them all, and let the site rest.

Reintroduce feeding gradually afterwards, with clean feeders in a fresh position, and keep watching. If you can, report what you have seen to a garden bird health survey, as these records help track outbreaks across the country. Sick birds need space, not a crowd — and a fortnight of patience from you is often all it takes to break the chain.