Biology / Unit 11 Bio 2521 short lesson, about 20 seconds
Secondary Growth: Vascular Cambium and Cork Cambium
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The idea
Secondary growth thickens a stem through cell division in two lateral meristems: the vascular cambium, adding xylem and phloem, and the cork cambium, adding bark.
In practice
A woody stem's vascular cambium divides to form new xylem inward and new phloem outward each growing season.
Where people slip
Secondary growth occurs in some dicots but rarely in monocots, which mostly lack the lateral meristems it depends on.
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