Plantes artificielles pour extrieur Artiplantes File:GomboH.jpg Wikimedia Commons This is a very interesting horticultural process called guttation! When the soil is nice and hydrated at night, root pressure builds up. Since the plant isn't transpiring (sweating) in the dark, it Common Name: Tree Rhododendron Native: Himalayas, Western Ghats (India) Description: 1. Evergreen tree (10 15 meters tall) 2. Pink to purple flowers (February May) 3. Large, leathery leaves (elliptical shape) 4. Found in high altitude