Explain now it is possible that a short day plant and a long day plant growing in the same location could flower on the same day of the year.
If a short day plant is artificially given long and uninterrupted dark period, it flowers even under long day conditions. Similarly, if a long day plant is artificially given long photoperiods, it flowers even under short day conditions. Thus, it is possible that a short day plant and a long day plant growing in the same locality are made to flower on the same day of the year by providing suitable photoperiodic conditions artificially.