Optimal photoperiods for every growth stage
When to Flip to 12/12
Most plants double in height during the "stretch" period after flipping. Switch to 12/12 when plants are half the desired final height. Indoor: typically after 4-8 weeks of veg. Teens can be flipped sooner since they're already vegged.
Outdoor Light Cycle
Outdoor plants follow the natural sun cycle. In California, plants naturally start flowering in mid-August as days shorten below ~14 hours. Fast-flowering strains finish before October rains. See the growing calendar for regional timing. More: Growing Guide | VPD Guide | Nutrients
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