Are my Roots Showing? No, we don't mean your hair color needs a retouch!
Have you ever wondered why some trees have their roots showing?
Well, here's the answer.
Aerial roots are roots above the ground. They are almost always adventitious. They are found in diverse plant species, including epiphytes such as orchids, tropical coastal swamp trees such as mangroves, the resourceful banyan trees, the warm-temperate rainforest rātā (Metrosideros robusta) and pōhutukawa (M. excelsa) trees of New Zealand and vines such as Common Ivy (Hedera helix) and poison ivy (Toxicodendron radicans). Wikipedia free encyclopedia
Aerial root pumping and physiology
Aerial roots may receive water and nutrient intake from the air. There are many types of aerial roots, some such as mangroveaerial roots, are used for aeration and not for water absorption. In other cases they are used mainly for structure, and in order to reach the surface. Many plants rely on the leaf system for gathering the water into pockets, or onto scales. These roots function as terrestrial roots do.
Some surprising results in studies on aerial roots of Orchids show that the 'Velamen' - the white spongy envelop of the aerial roots, are actually totally water proof, preventing water loss but not allowing any water in. Once reaching and touching a surface the Velamen is not produced in the contact area, allowing the root to absorb water like terrestrial roots.
Many other Epiphytes - non-parasitic or semi-parasitic plants living on the surface of other plants, have developed cups and scales that gather rainwater or dew. The aerial roots in this case work as regular surface roots.  There are also several types of roots creating a cushion where a high humidity is retained.
These are known as buttress roots and can grow to be taller then a human.(pictured above)
Typical Aerial roots (pictured above) Interesting facts about trees and their root systems. And most people just like them for their shade!
We hope you have enjoyed this post about Aerial Tree Roots. Now go plant some Trees!