It had observed that after flowering, the axillary buds were growing vegetatively in C-genome varieties of Brassica. This phenomenon is called“Semi-vegetative growth”. In this experiment, semi-vegetative growth was studied. Several varieties with different ecotypes in C-genome were used. The seeds were sowed in Autamun 1967 and the plants were grown in green house. And these plants were used as materials. Observation was made from 15th May to 15th July, 1968. The axillary buds were collected several times during the period and the morphological and histochemical changes of the shoot apex were studied.The results were as follows:(1) Semi-vegetative growth was observed in all C-genome varieties used.(2) In this period, tunica layers of the shoot apex were increased from 2 layers to 3 layers which represents the vegetative growth in C-genome variety. So, it was cleared that the growth phase transfered from reproductive growth to vegetative growth.(3) This fact was also clearly recognized by histochemical observation of the shoot apex.