Abstract: There is definitely seasonal activity in cambial growthes in the Phyllanthus emblica, Myrica rubra, Acacia mearnsii, The periods of cambial activity are respectively from May to No-vember, March to December and February to October. These cambia are dormant in other time in a year. The cambium of Casuarina cunninghamiana is active all year round. There are phragmoplasts in tangential sections of cambium in January and February. During dormancy of cambia, every species retains rather wide functional phloem (0.2- 0.3 mm in width).

Key words: Phyllanthus emblica