The biggest variability in how long a marijuana plant takes to grow will happen in the vegetative stage—after the seedling phase and before flower.
Unlike outdoor growing, you aren’t tied to the sun and the seasons. You will be providing the entire environment the plants need to grow, including the grow medium—soil, rockwool, etc.—and regulating the amount of water and nutrients they receive, as well as controlling temperature, humidity, and more for them.
Controlling temperature in your indoor grow room or cannabis garden can be achieved by manipulating these factors:
Plants need 18 hours of light a day when in the vegetative stage and 12 hours a day when flowering. The reduction in light from 18 to 12 hours a day is what triggers the flowering cycle—when weed plants start to grow buds.
Indoor marijuana grow timeline
Plants need fresh air to thrive and carbon dioxide (CO2) is essential to the process of photosynthesis. This means you will need a steady stream of air flowing through your grow room, which will allow you to move hot air out of the space and bring cool air in.
The two factors you need to control to dial in the environment are temperature and humidity.
In addition to bulbs, HID lighting setups require a ballast and hood/reflector for each light. Some ballasts are designed for use with either MH or HPS lamps, while many newer designs will run both.
Benefits of growing weed indoors
Even in legal states, you may want to conceal your crop from judgmental neighbors and definitely from potential thieves. Growing indoors allows you to grow discreetly behind a locked door.
Check out our Guide on nutrients for more info.
That’s probably a few years off though.
T he Canadian government, which is likely to legalize cannabis nationwide this summer, said it planned to allow home grows of up to four marijuana plants, which might yield 5lb in a year to an experienced grower, and is certainly consumable by an experienced smoker.
“It’s not rocket science,” she said, but it does involve some knowhow.
As legalization spreads, more cannabis enthusiasts are naturally going to want to try cultivation for themselves. The 2018 National Gardening Survey found 15% of US households would grow marijuana at home if it was legal. But, along with edibles, home growing is generally among the most contentious topics within the legalization debate.
How to grow your own weed
The plants can attract unappetizing blights like spider mites, fungus gnats, powdery mildew and grey mold, also called bud rot. And the odor can annoy neighbors. The most vocal opponents of home growing may be the Quebec government which has said it will not allow home grow immediately, as part of an effort to legalize at its own pace.
Cannabis is a sexed plant; the drug is the flower from the female. The hard to detect presence of a male plant can ruin the flower produced by a whole room of females. To avoid pollination, large-scale marijuana grows typically use clones instead of seeds, and Graf recommends novice growers to begin with clones as well. The wrong lighting can also be ruinous for a very expensive crop.
Allowing it, police say, enables criminals to hide in plain sight. For law-abiding growers it could invite burglaries, since their stash is worth $1,000 a pound and easy to resell. Firefighters worry about the blazing hot lightbulbs growers use and their elaborate electrical set-ups.
In response, the Canadian Real Estate Association hit the panic button and called for a nationwide moratorium on home growing until it can be better studied. The group says home grows could deplete property values, and also raise rents, especially for low-income tenants. Supporters of the law say four plant grows pose minimal risk.
Conversations about variation in soil substitutes, light spectra and humidity are frequent and achieve Warholian feats of boredom. They’re also potentially very important. As a high-value crop, cannabis may attract investment into lighting, water management and other agricultural technologies that might go ignored when the crop is $2 heads of lettuce. These new technologies are environmentally friendly and potentially earth-shattering politically, since they could transfer agriculture to cities.