<Table> <Tr> <Td> </Td> <Td> This article may be too technical for most readers to understand . Please help improve it to make it understandable to non-experts, without removing the technical details . The talk page may contain suggestions . (February 2013) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This article may be too technical for most readers to understand . Please help improve it to make it understandable to non-experts, without removing the technical details . The talk page may contain suggestions . (February 2013) (Learn how and when to remove this template message) </Td> </Tr> <P> The vascular cambium (also called main cambium, wood cambium, bifacial cambium; plural cambia) is a plant tissue located between the xylem and the phloem in the stems and roots of vascular plants . It is a cylinder of unspecialized meristem cells that divide to form secondary vascular tissues . It is the source of both secondary xylem growth inwards towards the pith, and secondary phloem growth outwards to the bark . Unlike the xylem and phloem, it does not transport water, minerals or food through the plant . </P> <P> Vascular cambia are found in dicots and gymnosperms but not monocots, which usually lack secondary growth . A few leaf types also have a vascular cambium . In wood, the vascular cambium is the obvious line separating the bark and wood . For successful grafting, the vascular cambia of the rootstock and scion must be aligned so they can grow together . </P>

Where does the vascular cambium get its energy to produce more xylem and phloem