Reproductive phase in a plant starts with the initiation of flowering. Some plants flower in a particular season only, some flower throughout the year. Plants like Agave, bamboo and certain palms bear flowers only once in their life time. Such plants are known as monocarpic. The stage of flower opening from a flower bud is known as anthesis.
The schedule for flowering of a plant is so definite that it can be predicted. The physiological mechanism responsible for the flowering of plants has been found to be controlled by:
i) light period photoperiod
ii) Temperature Vernalization