Answer: Photoperiodism is the response of plants to changing lengths of day and night. Plants actually measure the duration of darkness, rather than the hours of daylight. Plants differ in their day length requirements, because they each have a certain photoperiod requirement to help them accomplish the process of flowering. Of course, only mature plants will be able to flower and it takes time for leaves and stems to become mature enough that their systems can be stimulated by the hormones within. <br><br>So, the short answer to your question is simply this - if you force a plant to grow at an accelerated rate by keeping the lights on constantly, the plant will become large but not necessarily mature. In the case of seedlings, I've grown them under constantlight and haven't had any problems--I imagine it's because they're inside for a relatively short time.
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