Marijuana plants can be forced to flower at any size. Their flowering is regulated primarily by the light cycle, rather than their size or chronological age. Both a large three month old plant and a newly germinated one respond to a daily cycle of uninterrupted dark periods of about 12 hours by changing from vegetative cycle to flowering cycle.
The size of the plant at maturity and its yield is determined to a great extent by the size of the plant when it was forced to flower.
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