Gardeners are being encouraged to reuse water from showers, baths and washing-up on their plants during dry weather, but experts have warned it should not be stored for more than 24 hours.
Water collected from showers, baths and even washing-up can be given a second use in the garden rather than going straight down the drain, according to advice highlighted during this summer's dry conditions.
24-hour rule for grey water
However, there is one important rule gardeners should follow. The Royal Horticultural Society (RHS) advises that so-called grey water should not be stored for longer than 24 hours because bacteria can begin to build up.
The advice comes as gardens across parts of England have struggled following prolonged periods of little or no rainfall. Plants may show signs including curled leaves, stunted growth or premature leaf drop, although experts say this does not necessarily mean they are dead.
RHS expert advice
Nicholas Cryer, senior water scientist at the RHS, said: "With prolonged drought becoming an ever more frequent feature of British summers, we must learn to manage water more efficiently. The estimated 60 litres of grey water produced per person within the home each day can be recycled in our gardens, reducing demand on mains water."
He said plants can safely be watered using water from showers, baths, kitchens and washing machines. However, gardeners should avoid water containing bleach, disinfectants, dishwasher salt or strong cleaning products.
Exception for edible crops
There is another exception for anyone growing their own food. Cryer added: "Grey water should not be used on edible salad crops, but it is a suitable choice for ornamental plants."
