by Catalina
(San Jose)
Some plants time their blooms to the amount of sunlight they receive. When the hours of sunlight gets smaller, they bloom more. These are called "short day" plants or SDP. Others plants are triggered to bloom only when the days are at a certain length. These are called "long-day plants” LDP. Sunflowers are known for their photoperiodism, or their ability to open and close in response to the changing position of the sun throughout the day. So are Moonflowers. They are well know short day plants. They open quickly in the evening, last through the night and remain open until morning.
But why does it matter for a plant to bloom at a certain time of year? How does it relate to photosynthesis?
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