Abstract Wageningen UR Greenhouse Horticulture conducted in close cooperation with the Dutch freesia sector research on the effects of climate on dry matter production of Freesia plants. The relationships were established on the basis of photosynthesis, growth and climate data measured in greenhouses of Freesia growers. The relationships were incorporated in a dynamic growth model that correctly simulated the dry matter growth in a series of trials. A user-friendly interface was satisfactorily developed interactively with a number of Freesia growers. The model can be used by growers to find the most optimal combination of climate factors for Freesia growth at given plant age and greenhouse settings
