According to the RHS, 24,000 litres (5280 gallons or 150 water butts) could be collected from the roof each year, even in dry areas.
However, most water falls in winter and so needs to be stored for use in summer.
The RHS said: “Our mains tap water in the UK is of the highest quality, but plants don’t need perfectly clean water.
“As gardeners, we can help to avoid hosepipe bans in the future by using our water resources wisely.”
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