INFLUENCE OF DAYLENGTH AND TEMPERATURE ON GROWTH AND DEVELOPMENT IN POINSETTIA (EUPHORBIA PULCHERRIMA WILLD.)
During the last years many valuable cultivars have been introduced which have created new enthusiasm for poinsettia. It is of great importance in intensive plant production to be able to time the flowering with great accuracy. Daylength and temperature may be relatively easily adjusted in greenhouses and it is necessary to have exact information about the optimal conditions for the plant at the various stages of development. Since the literature is not conclusive on this point, several experiments have been conducted in order to gain knowledge as to the effect of light, temperature and other cultural factors on growth and development of the new cultivars.