Outdoors, flowering occurs naturally when the plant receives less light each day as summer turns into fall. Indoor growers can trigger the flowering cycle by reducing the amount of light marijuana plants receive from 16 to 12 hours a day.
Seed germination length: 3-10 days
Generally speaking, it takes anywhere from 10-32 weeks, or about 3-8 months, to grow a weed plant from seed. It’ll be quicker if you start with a clone or an autoflower seed.
Once your seed has germinated, or sprouted, it’s ready to be placed in a growing medium, like soil. The tap root will drive down while the stem of the seedling will grow upward.
The flowering stage is the final stage of growth for a cannabis plant. This is when plants start to develop resinous buds and your hard work will be realized. Most strains flower in 8-9 weeks, but some can take even longer, especially some sativas.
Be sure to keep a grow journal to track the progress of your plants. Looking back on your notes will help you learn from mistakes and maximize the quality and quantity of your buds.
If you buy a clone from a grower or breeder it will be a seedling, so you can skip the seed germination phase.
Notes on marijuana growth phases
At this stage, the plant is vulnerable to disease and mold. Keep its environment clean and monitor excess moisture. Be sure to give it plenty of light.
Everything should be cleaned up, dried, and curing well before the Winter Solstice. Now’s a good time to make your own cannabutter, topicals, or tinctures with all that trim from the harvest. Kick your feet up, relax, and hunker down for the cold, it’s been a long growing season!
These factors have the greatest impact on total time from seed to harvest:
The average indoor cannabis grow takes 3-4 months from seed to harvest. The full range is 2-6 months and depends on the strain and desired size of plants.
How to grow marijuana as quickly as possible:
Important Milestones in the Marijuana Plant’s Life
This plant didn’t spend any time in the Vegetative Stage. It was given 12-12 lighting almost immediately after sprouting. It’s so small that it spent its whole life in a solo cup, and its only light came from CFLs. I weighed down the bottom of the cup so it didn’t fall over. It ended up yielding about 0.75 oz.
Jump to the Section of the Tutorial You’re Interested in:
Before You Start Growing Weed
So, after you’ve bought seeds and equipment, grown a plant from seed to harvest, trimmed, dried and cured your buds, that brings us back to the original answer…
To give you an idea as to what your FINAL marijuana plant may look like depending on how long it spends in the vegetative stage…
Time Needed to Grow Weed, From Seedling to Harvest
Additionally, for at least the first time you grow, you also need to consider the time needed to get your equipment and seeds/clones.