Anomalous Secondary Thickening in Dracaena Anomalous Secondary Thickening in Monocots Before going to the secondary thickening in Dracaena, first see what anomalous secondary thickening is and how the process of anomalous secondary thickening happens in plants.
Increase in lateral thickening is called secondary thickening or secondary growth. This growth occurs in stem and root parts of shrubs and trees in Dicotyledons. This development takes place in stele (intrastelar secondary growth) and also in cortex (extra stellar secondary growth).
Primary growth of some roots is followed by secondary growth involving formation of secondary vascular tissues by the cambium and of periderm by a phellogen (cork cambium). Secondary thickening may start during the first or second year.