The cannabis garden is filled with variables and measurements, but few factors carry as much influence over plant performance and yield as veg timing. Especially in multi-tier environments, where space is limited and airflow is tightly controlled, understanding how long to keep plants in the vegetative stage—and at what height—is one of the most powerful decisions a grower can make.
Unlike outdoor cultivation, indoor growers control every environmental variable. One of the biggest levers at your disposal is the length of time a plant remains in its vegetative state under an 18-hour photoperiod. During veg, the plant builds its structural foundation, developing shoots, roots, and energy stores to determine how it performs when flipped into flower under a 12-hour light cycle.
But here's the rub: plants don't just stop growing the day they're flipped into flower. Most cultivars go through a significant "stretch" phase during the first two to three weeks of the flowering cycle, during which they can double or even triple in size. And in a multi-tier facility where the distance between tray and light might be only 5 to 6 feet, mistiming your veg leads to a domino effect: plants grow into lights, airflow gets restricted, microclimates form, pathogens thrive, and yields suffer.
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