You’ll want to stop fertilizing your marijuana plants about two weeks before the flowering stage finishes. This will allow your irrigation and watering to rinse minerals and nutrients out of the plant, making it safe and enjoyable for use.
http://www.ilovegrowingmarijuana.com/flowering-stage/
So, my suggestion is that we compare the one gallon of water per day during the height of the growing season (say 100 days, which is when it’s driest and plants are largest) per pound of cannabis means that 100 gallons of water yields 450 joints with equivalent “human upliftment” to 450 bottles of wine.
http://www.theganjier.com/2015/07/02/how-much-water-does-one-marijuana-plant-need-to-grow/
If you want to choose the best time to cut your marijuana plants, keep reading, because we are going to reveal the keys to determining the best time to harvest your marijuana. 05/10/16. Choosing the best days to harvest your cannabis plants will depend on several factors (weather, pests, genetics ...).
https://www.dinafem.org/en/blog/best-time-harvest-cannabis/
Jump to the Section of the Tutorial You're Interested in: 1  Before You Start Growing Weed (0-4 weeks) 2  Time Needed to Grow Weed, From Seedling to Harvest (8 weeks - 5+ months) 3  Germinate Your Seeds (1-5 days)  Vegetative Stage (2 weeks - 2+ 1  months) Flowering Stage (6 weeks - 4 months)  Post-Harvest (This is when the smell/taste/look you love shows up)
http://www.growweedeasy.com/how-long-does-it-take-to-grow-weed
Answer Wiki. 11 Answers. Actually, it depends on several factors: light, humidity, temperature, genetic. But I think light is the most important. Cannabis needs power/energy from the light to grow. If you grow outdoor, it will take about 3–6 months. If you grow indoor, it will take shorter: about 2–3 months. Growing indoor, light source is important. Now LED grow light is best light source for the plants.
https://www.quora.com/How-long-does-it-take-to-fully-grow-a-marijuana-plant
Start of flowering stage – Day 45. During the first two weeks of the flowering stage your cannabis plant gets taller and the spaces between the leaves (internodes) will begin to shorten. Shortly after this, you will begin to see the first pistils appearing. You’ll know the flowering phase has started in earnest when you see a lot of these.
http://www.ilovegrowingmarijuana.com/flowering-stage/
Trichomes are present on the cannabis flower and are responsible for developing the plant's THCA, CBDA and other cannabinoids. These small glands have a life cycle, and by looking at what point of this cycle they are at you will be able to determine how mature your marijuana plants are.
https://www.dinafem.org/en/blog/best-time-harvest-cannabis/
But Ultimately How Long to Harvest Marijuana Depends on the Yields You Want. Jump to the Section of the Tutorial You're Interested in: Before You Start Growing Weed (0-4 weeks) Time Needed to Grow Weed, From Seedling to Harvest (8 weeks - 5+ months) Germinate Your Seeds (1-5 days) Vegetative Stage (2 weeks - 2+ months) Flowering Stage (6 weeks - 4 months) Post-Harvest (This is when the smell/taste/look you love shows up)
http://www.growweedeasy.com/how-long-does-it-take-to-grow-weed
We'd usually spend 2 months on long days (vegetative growth), and another 30 to 40 days on equal days/nights (budding stage), for a total of about 3 months or just more. Keep in mind, an outdoor plant can grow as large as a fruit tree and have a yield of around a pound.
https://www.quora.com/How-long-does-it-take-to-fully-grow-a-marijuana-plant
If you let the optimum harvest date slip by, you will notice that the trichomes feature a darker, candy brown colour. The ideal time to harvest your marijuana plants is when most of the trichomes are milky white, and some (about 25%) are amber.
https://www.dinafem.org/en/blog/best-time-harvest-cannabis/
how many months for an outdoor marijuana plant to mature
It takes 3 to 6 months  for an outdoor marijuana plant to mature. It takes 3 to 6 months for an outdoor marijuana plant to get mature.