The cambium of a plant is a meristematic region located in the stem of a plant that allows for lateral growth. Both the primary xylem and secondary phloem arise from the cambium. The cambium itself arises from the procambium that arises from the primary meristem itself. The undifferentiated cells of the cambium allow for it to have growth encouraging properties. Plants are initially composed of the pith, primary xylem, vascular cambium, primary phloem, and cortex (in that order from the center of the plant). They later develop to become composed of the primary xylem, secondary xylem, vascular cambium, secondary phloem, primary phloem, and cork cambium. Finally, it becomes composed of a secondary xylem, vascular cambium, secondary phloem, cork cambium, cork, bark, and periderm. These processes are all made possible by a plants cambium.