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exists and is an alternate of . Yes, the color of the light will effect how the plant grows. If you put sa plants under a U.V light and the light color is red the plants will grow better than the U. V lgith color that is black.
1 Under artificial light, a marijuana plant can grow from three to six feet tall in three to four months. 2  Plants entering the vegetative stage enjoy up to twenty two hours of light per day, while twelve hours or less is required for flowering.