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How to Induce Flowering. Because of photoperiodism, you can easily induce flowering in cannabis plants simply by changing your grow room light cyclesâreducing the light from 18 hours a day or more, to only 12 hours each day.
Evening primrose (Oenothera biennis) opens its four-petaled blossoms after sunset or on dark cloudy or rainy days. It is worth the time to visit an evening primrose plant at dusk and watch as the cream to bright yellow petals unfold like a slow-motion film.