Of 124 coffees in the world, we only drink two, but we need to protect all of them, say scientists.Read more
BBC Environment correspondent
Plant collectors have searched for the hidden wonders of the plant world for centuries.
Yet plants that are new to science are still being described, at a rate of about 2,000 a year.
Scientists at the Royal Botanic Gardens, Kew, discovered and named more than 100 new plants in 2018.
Artist Lucy Smith draws plants so that they can be recorded for science at the Royal Botanic Gardens, Kew.
People living in Paris are planting little gardens in the streets.
The low-lying shrubs, grasses and other plants growing in the Arctic are increasing in height.