We all have a general idea of how a tree grows but there is so much more going on inside that most of us aren't even aware of.
Source: ShutterstockA tree's outer bark protects it from all types of hazards, including pests, insects and some diseases, but did you know there is also an inner bark which is continually dying off and then rejuvenating itself? Called "phloem," this is how food is carried throughout the trunk and branches. When the phloem dies off, it becomes part of the outer bark.
Each tree has a cell layer called the cambium. Annually a tree's new bark and wood are produced by the hormones called "auxins." These auxins are manufactured in the spring when those tender leaf buds began forming at the end of all the branches. They are passed down through the tree's food system by mixing with the phloem.
Sapwood is the inner new growth and how water is moved through the tree. As sapwood matures, the rings then become known as heartwood which is the main core or center of the trunk.
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