Why Sir David Attenborough wants you to leave a spoonful of sugar in your garden

British naturalist and broadcaster Sir David Attenborough in the garden of his home

Sir David Attenborough is a national treasure, so when he says jump, we get bouncing – and when he shares his tried-and-tested garden advice, we sit up and pay attention.

Even when... well, even when his garden ideas are a little bit out there. Like, say, his recent suggestion that we leave a spoonful of sugar in our backyard during hot weather.