Vascular cambium is found in between the xylem and phloem in woody stems, it produces xylem to the inside of the stem and phloem to the outside of the stem. Each ring consists of an area of light-colo...Vascular cambium is found in between the xylem and phloem in woody stems, it produces xylem to the inside of the stem and phloem to the outside of the stem. Each ring consists of an area of light-colored wood (spring wood) that is formed during the spring when water is readily available for plant growth, and an area of dark wood (summer wood) that is formed late in the growing season when water availability is starting to decrease.