Photoperiod or autoflower? If it’s an auto than it’s on its own schedule to start flowering usually between weeks 3and 4 then consider to flower for an additional 6to8 weeks. As auto’s don’t need light adjustments to enter flower you can grow them under a more generous light schedule, 20 hours on and for hours of darkness is probably the most common setup for autoflowers.
Growing regular photoperiods is much different because if grown outside you rely totally on nature’s light cycle. Most planting outside occurs in spring or early summer so your plants have a chance to grow (vegetate) though June and July. Somewhere between the second or third week of July the plants will determine what sex they are (unless you are growing feminized seeds) male or female. Once they have sexed is when they will start a period of called the stretch and your plants can sometimes double in size especially when grown outside. During stretching the plant will go into preflower and will produce an abundance of pistils at the nodes and subsequently become full flowers. Stretch outside is usually finished by the third week of July and most certainly by the first of September.
Flowering photoperiods if indica could potentially be ready for harvest by the end of September or early October and a sativa the middle of October to the beginning of November.
A lot to take in but those are the ins and outs of cannabis cultivation as far as flowering time lines.
Learn how to water your plants correctly is the single most important thing to know when growing cannabis. Do some research on line and ask questions. Watering incorrectly is the most common way people destroy their crops.
Hope this helps.
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