The Key to Successful Indoor Marijuana Cultivation

If you’re in an area where cultivation is legal, growing cannabis indoors is a rewarding, cost-effective way to get the herbal enjoyment you’re looking for. While outdoor farming has benefits, indoor harvests are more controllable and are better for beginners. Here, we’ll list a few things to consider if you’re growing a crop indoors.

Grow Room Setup

You’ll need a suitable space if you’re interested in growing marijuana indoors, such as a basement, a garage, or a spare room. If space is limited, even a closet will work. Cannabis plants need time in the dark; if too much light gets into the grow room, it will stress the plants and encourage self-pollination.

Start with a manageable grow room that holds five to ten plants and a single light that can fill the space. By starting small, you’ll learn about cannabis growth patterns and acquire the skills needed to cultivate bigger crops.

Seed Selection

The most crucial step to indoor marijuana cultivation—other than setting up the grow room, of course—is starting with the best seeds. Cannabis seeds should be hard, dark, and dry. Most sellers offer non-feminized and feminized seeds, which fulfill different purposes. Most strains are bred with indoor cultivation in mind, including:

  • Sour Diesel
  • Northern Lights
  • OG Kush

New growers should stick to feminized or auto-flowering seeds, as they can grow in colder conditions and mature depending on age rather than light quality. Auto-flowering strains are crossed with others for disease resistance, higher yield, and increased THC production.


Germinate cannabis seeds by soaking them between moist paper towels and waiting for taproots to emerge. Once that happens, transfer the seeds into a growing medium such as soil. Keep the seeds damp, but don’t overwater them.


Next, the seedlings will move into their vegetative stage. Give them anywhere from 18 to 24 hours of light per day and keep the temperature between 70 and 85 degrees Fahrenheit. Feed and water the plants regularly, taking time to remove male plants and prevent pollination.


During vegetation, many growers use the SOG (sea of green) or SCROG (screen of green) method to train their plants and maximize yield. In SOG, plants are kept in the vegetative phase and cuttings are taken before they’re put in a 12/12 light/darkness cycle. On the other hand, the SCROG method uses a grid that holds plants’ branches, keeps them similar in size, and creates a level canopy. SOG and SCROG techniques aren’t very beginner-friendly, and it’s best to grow a crop or two before trying them.


During flowering, female cannabis plants will develop the fragrant, heavy buds we all love. As the buds, resin glands, trichomes, and hairs develop, stop training the plants and move them to a 12/12 lighting cycle. Near the end of the phase, stop fertilizing the plants and flush them with plain water.


Most growers harvest when the plants’ trichomes are evenly mixed between amber and cloudy. Cut the main stems and hang plants upside down to dry for about five weeks. Trim the buds and enjoy your natural, relaxing crop.

Cannabis Cultivation: The Takeaway

Growing cannabis indoors is an upfront investment, but it can help you avoid the cost and inconvenience of buying heavily taxed products from dispensaries. By researching your state’s laws and following the tips in our guide, you’ll be well on the way to a fragrant, great-tasting, and healthy crop.