Watering plants myth debunked: 'If a plant needs water, water it'

The journal New Scientist has dispelled some old wisdom about the need to water your garden early in the morning before the day warms up. It says that's not necessary, and sometimes it's not a good idea - same with watering in the early evening. How can this long-agreed-on idea be wrong? Editor of NZ Gardener, Jo McCarroll joins us.