The blooming of flowers is due to non-directional responses to stimuli such as temperature, humidity and light irradiance and is known as "Nastic Movement". This movement usually takes place in the flat part of the plant that is oriented relative to the body of the plant. It typically takes place in petals and leaves that are bilaterally symmetrical.
Environmental changes send signals to the plant resulting in a differential growth between the lower and upper surfaces of the petals resulting in the blooming of flowers at different times of the day.
In the case of the jasmine flower, this response takes place at night fall due to change over from brightness to darkness. And as such the jasmine flower blooms only at night.
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