Indoor Marijuana Growing Systems

June 22, 2021

One of the first decisions to make, once you have decided to grow your own marijuana, is whether you will grow outdoors or indoors. This short guide article will discuss some of the basic information you should have before setting up your indoor marijuana growing systems.

Preparing to grow indoors has its unique challenges and benefits that you must know if you want to end up with the best stash of weed.

Download my free marijuana grow bible to learn more about indoor cannabis growing systems.

growing marijuana indoors

Every facet of the plant’s growth can be carefully monitored and adjusted to create the perfect environment for your plants. There are several variations available for indoor growers.

Want to have complete control of your growing environment while increasing potency and yield? Grow cannabis indoors! Check out high-quality indoor seeds in our shop.

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Hybrid Systems

Hybrid systems can offer plants both natural and artificial nutrients and light. Greenhouses fall under this category, for example.

Hybrid systems can range drastically in complexity, from the relatively high-upkeep of an artificially heated greenhouse to the simple placement of a couple of pots in front of a window.

The primary advantage to any of these hybrid systems is that they can use real sunlight.

Hybrid Systems

Many growers swear that natural sunlight is the best source for plants, even if it’s being filtered through glass. This makes sense since most bulbs used for artificial light simply don’t offer the same spectrum as the sun.

Additionally, tall windows in a small apartment can actually be close to ideal. If the windows reach down to the floor, the plant itself can be placed on the ground.

This is better than raising it up since it will be able to absorb additional carbon dioxide, which sinks down to the ground after being exhaled by humans.

Closed systems

Closed systems

While growing in front of a window is the simplest route, it’s not always an option for growers. Not every living space is equipped with tall windows, and even those that aren’t always a good choice.

In many parts of the world, it’s undesirable to put the cannabis plant on display. In order to receive light from outside, a grower has to make it possible for strangers to look in and see the plant itself.

In addition to the total control offered by closed systems, growers can also benefit from privacy. Although it can be a bit more work, it allows the grower to maximize the potential yield of the plant by optimizing the environment.

For these reasons, many growers prefer to use fully enclosed systems. This is especially true for larger scale or professional operations since it has the potential to be so efficient and offer higher yields.

Closed systems also allow growers to actually mutate their plants to achieve specific effects. The potency of cannabis grown indoors can be truly exceptional, with much higher ratios of the cannabinoids and other active ingredients so prized by growers and consumers.

The fully enclosed systems allow growers to saturate plants with optimum nutrients, but it also allows growing seasons to extend indefinitely.

The length and cycles of daylight can be radically altered, essentially “hacking” plants so that enormous yields can be achieved.

Grow room procedure

Grow room procedure

Although it can be more complicated than growing outdoors, an indoor grow room is simpler in some respects as well. Set up properly, an indoor grow room offers everything a grower needs to successfully raise a plant from seed to sprout and beyond.

Soil, fertilizer, and water are all added at regular intervals. Following instructions on how to care for plants inside will allow growers to get great yields.

Generally, plants should receive light in regular cycles of light and darkness. Twenty hours of light exposure followed by four hours of darkness is a good rule for growers to follow, with the temperature in the environment being kept at around 70 degrees.

Download my free mini harvesting guide to learn more about when and how to harvest your marijuana plants.

Once the plants have reached the desired size, the light cycle can be adjusted to alternating cycles of twelve hours light to twelve hours of darkness. The increased darkness will cause cannabis to flower, tricking the plants into thinking that the seasons are changing.

Regardless of the type of system used, it’s important to remember that the genetics of the seeds used will figure prominently in the quality of the end product. Buy only high-quality seeds from our online seed bank.

Buy Marijuana Seeds

FAQs About Growing Marijuana Indoors

What are the best indoor autoflower strains?

Among the best autoflower strains that you can easily grow indoors are Super Skunk Auto, White Widow Auto, Sour Diesel Auto, and Northern Lights Auto.

What are the best feminized strains to grow indoors?

Critical Mass, Amnesia Haze, Power Plant, Purple Haze and LSD strains are some of the best feminized strains you can cultivate indoors.

What is a hybrid growing system?

It is a growing system that offers plants both natural and artificial nutrients and light. Many growers believe that natural sunlight is the best source for plants, even if it’s being filtered through glass.

Becoming an expert marijuana grower only requires practice and learning. Start your cannabis growing journey by reading my blog.

Have you grown your own marijuana indoors? Please share your experience or leave questions below.

Happy growing!


The founder of I Love Growing Marijuana, Robert Bergman, is a marijuana growing expert that enjoys sharing his knowledge with the world. He combines years of experience, ranging from small-scale grows to massive operations, with a passion for growing. His articles include tutorials on growing... [read more]


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    1. By Wayne ,17 Apr 2021
      I love to grow been wanting to buy some seeds you should send me a couple to entice me to buy some asap
    2. By Frank ,13 Jun 2021
      You need a scrog net to set over the top of the plants.
  1. By Anthony ,13 Mar 2014
    What do you mean by plucking the leaves to stimulate THC growth? I must of missed that part.
  2. By Xua Yang ,21 Jun 2014
    What happen when my plants are budding but than starts to veg again? It is the temp or what happen? Any suggestions? Please help!!
  3. By Sandra ,25 May 2015
    I here ther's a site that helps people find a marijuana doctor, I think it was called maybe you could pass this on. Just thought it might help someone.
  4. By EHall ,02 Jun 2015
    I am doing my research into a grow box.Articles I have read states you need at least a 400 watt bulb for growing. the grow box I am looking at only has 60 wtts. Will my plants grow normally? Thank […]Read More
  5. By latewood ,03 Jun 2015
    Yes; Your plants will grow naturally. More powerful lamps cause more heat, and this might be too much for your grow box. You did not suppl us with dimensions or heat indexes. If you do a grow and find that […]Read More
  6. By TBones ,31 Dec 2015
    So far I like what I'm reading and I've read more then my share of books, articles and web sites looking for a writer who I first understand and second is an easy read. Now is where I give a […]Read More
  7. By RUSSELL ,03 Mar 2016
    How much water does a flowering plant need
    1. By latewood.ILGM ,04 Mar 2016
      Russel, A flowering plant needs as much water as it will uptake. It all depends on pot size, type of system, lights, environment. etc I advise you to join our grow support forum, and also; Download and read our free […]Read More
  8. By charlie ,30 Nov 2016
    Top article again - this site is tits, thanks Robert for your exceptional guides and info (no one needs to ask a question really, its all covered, don't be lazy and read!)
  9. By Lee ,21 Feb 2017
    With the Sea of Green method, would it work to do the vegetative phase under the lights 18-6 hours (for 4 weeks), take cuttings, then move them outside in a natural 12-12 hours (Hawaii) environment, then plant the trimmings and […]Read More
  10. By latewood_ILGM ,22 Feb 2017
    Lee, You definitely can veg plants for 4 true weeks and move them outside. A Sea of Green is done with clones. You can build your SOG outdoors with your rooted clones anytime you desire. You might have fun and […]Read More
  11. By Sam ,28 Feb 2017
    I got some big bud fem seeds grew in 1/3 soil 1/3 perlite and 1/3 vermiculite in pb18's have pH tester and cf truncheon followed all your guides and I am getting on average 20 GMs dry per plant under […]Read More
    1. By latewood_ILGM ,03 Mar 2017
      Sam, Your question appears to be a bit broad ranged for a blog comment section. You need to join our support forum for extended support over several Q and A's. One thing that rings out to me is your […]Read More
  12. By Lou ,20 May 2017
    I am growing indoors with an Aerogarden hydroponic system. My plants (white widow fem) are on a 17/7 cycle right now and are approx 6 inches tall. When should I switch the light cycle to force flowering and should it […]Read More
    1. By Kyle ,26 Feb 2021
      Wow, you really jumped right into gardening, and seems you are without any knowledge of what you are doing....I don't want to sound mean, but if you need to ask a question like that there are a few things you […]Read More
  13. By latewood.ILGM ,25 May 2017
    Lou, You cannot switch to flower until the plant is at least been in veg for 1 month. Most growers Veg for 2 months for bigger yield. IN an aerogarden, you may want to flower after 1 month to limit […]Read More
  14. By JGD GoB ,18 Jul 2017
    Is it a good idea to give autoflower plants more than 12 hrs of light during flowering. Plz and thanks
    1. By latewood.ILGM ,21 Jul 2017
      JGD GoB, Auto flower genetics should be grown under the same photo period from start to finish. 16-18 hours of light and 6-8 hours of dark. Never change or shorten photo period unless you want the plant to stop growing […]Read More
  15. By Tony BUGS davis ,03 Jan 2018
    My first indoor grow was amassing to me white widow strand #1 for me trying to figer out my next strand durbin poison I thank send me some pointers thankstony
  16. By drew ,15 May 2019
    I love it,Been doing it for years, you actually sound like one of my cousins in northern Cal, In in fl doing my thing great results , live long and pain free!
  17. By liz ,13 Mar 2020
    hi love your site and the info you provide I have tried several times to download the grow bible, it never gets to my mailbox or spam]]Thank you
  18. By Renae Hiebert ,21 May 2020
    First time grower. I’m growering indoors in a grow tent. Is it hard to grow in one of those?
  19. By Lemonhead OG Strain Review ,18 Aug 2020
    […] you give your Lemonhead OG weed enough room, it will provide impressive indoor yields. Look for 10-14 ounces per square yard indoors. Harvests are typically ready in eight to nine weeks […]
  20. By John p. ,06 Feb 2021
    I have a problem with my indoor plants taking longer. To finish budding ! I have fellow growers that harvest when they reach a certain number of days flowering? I go by the look at the Tricombs. Who’s right?
    1. By Carl ,29 Apr 2021
      How many 2000 watt lites for a 10 × room? Thanx
  21. By James ,08 Apr 2021
    Thank you for that informative read.
  22. By James ,08 Apr 2021
    And I tried one type of pruning method and it produced!!!!!!! Thank you again. Cheerz James
  23. By Kimberly ,15 Jun 2021
    Thank you! Nice to have such a great resource as yourself.

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