Short answer: How long it takes to grow cannabis depends on the plant type and grow setup. Autoflowering cannabis often finishes in about 8 to 12 weeks from seed to harvest, while photoperiod cannabis commonly takes 3 to 5 months indoors and about 5 to 7 months outdoors when grown with the natural season.
Stage-by-stage cannabis grow timeline
Most growers count time from seed or clone to harvest. Drying and curing add time after the plant is cut.
- Germination: 1 to 7 days for seeds to pop and show a root tip.
- Seedling: 1 to 3 weeks while the plant builds its first leaves and roots.
- Vegetative: 3 to 8 weeks for photoperiod plants, though growers can extend this stage. Autoflowers move on their own and spend less time here.
- Flowering: 7 to 10 weeks for many photoperiod strains after switching to a 12/12 light schedule. Autoflowers flower on their own schedule within the total 8 to 12 week window.
- Harvest and dry: 7 to 14 days to dry trimmed buds before curing.
- Curing: 2 to 4 weeks or longer for flavor and smoothness, though this is optional and not part of the grow cycle itself.
Autoflower vs photoperiod cannabis
Autoflowering cannabis starts flowering based on age, not light schedule. That makes the total cycle shorter and simpler for many home growers. Photoperiod cannabis stays in vegetative growth until the light cycle changes, so the grower controls the length of the veg stage. This gives more control over plant size and harvest timing, but it also adds weeks to the schedule.
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Indoor vs outdoor grow time
Indoor growers can start at any time of year and control light, temperature, and humidity. A photoperiod indoor grow often lands in the 3 to 5 month range, while autoflowers can finish in 8 to 12 weeks. Outdoor photoperiod plants follow the sun. In most climates, they are planted in spring, grow through summer, and flower as daylight shortens in late summer or fall. Outdoor autoflowers can be run in shorter windows, but heat, cold, rain, and pests can shift the timeline.
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Harvest, drying, and curing time
The grow is not finished the moment buds are cut. Drying usually takes about one to two weeks in a controlled space. Curing adds another two to four weeks for many growers. If you count the full process from seed to a cured final product, add several weeks to the flowering timeline.
What changes the cannabis grow timeline?
- Genetics: Strain and autoflower or photoperiod traits set the basic schedule.
- Light schedule: Photoperiod plants depend on the switch to flowering.
- Container size and root space: Small pots can limit growth and speed or slow development.
- Environment: Temperature, humidity, airflow, and water quality affect growth rates.
- Training and stress: Pruning, transplanting, and other stress can slow plants down.
- Climate outdoors: Short seasons, cold nights, and wet weather can delay or shorten the harvest window.
Use breeder estimates as a guide, not a guarantee. Track your plants from germination onward and judge harvest by bud development and trichome color, not by the calendar alone. Legal growers should also confirm local rules before starting a home grow.