Abstract
1. The responses of freesia to photoperiod was studied by shading and lightening before and after the flower bud differentiation.
2. By shading, the time of flower bud differentiation of the plants was hastened a little, about 10 days, but was neither hastened nor prolonged by lightening, as compared to the check plants.
3. By lightening, the flower bud development of the plants was promoted more or less.
4. Total number of flower buds on a plant was increased by shading, and was reduced by lighten-ing.
5. Height of plants in the shaded and lightened plots was slightly taller than the height of plants in the check.
6. No significant difference was found about stem length, number of leaves, term of harvest, and number of flower buds on a main stalk, by the treatments.
