What is cambium?
3A. Cambium is the growing part of the tree. It is located on the outer edge of the tree. The inner cells of the cambium produce the woody part of the tree, while the outer cells of the cambium form the bark. The woody part of the tree is for support. The cambium contains the tubes which conduct the nutrients up from the soil (xylem tubes) and the phloem tubes which conduct the manufactured food downward. If you girdle a tree, you interrupt this flow and the tree dies.