At New Vithanakande (in the south of Ratnapura, Sri Lanka), to keep the tea plants at the right height, the trees serve as a kind of traffic light system: if you see green, the tea plant is not too high, if the green disappears it is the orange that shows, and the plants need to be cut lower, and if only the red shows, things have got out of hand!
Tea trees looking like traffic lights
14 May 2010