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Growing Marijuana Indoors

Complete overview of growing marijuana indoors

Are you interested in growing marijuana indoors? You’ve come to the right place! 

Becoming a home grower is very popular right now as the US weed laws in many states allow the cultivation of marijuana. 

Don’t know where to start? Let’s go over everything you need to know about growing weed at home. We’ll cover where to start, the advantages, the maintenance, and some frequently asked questions. 

How to start growing marijuana indoors

Are you wondering how to grow marijuana indoors? It takes some investment, but after that, you’ll have boatloads of high-quality homegrown weed. 

You’ll need to find a space for growing marijuana indoors. Ideally, a closet or small room works best. 

Growing Marijuana Indoors

When choosing your indoor gardening area, think about the factors that go into growing marijuana indoors. Ask yourself these questions:

  • Does this area preserve heat well?
  • Can this room withstand increased humidity without producing mold?
  • Are there windows for natural ventilation, or where can I add an air duct? 
  • Are there windows for natural light or enough outlets to plug in indoor grow room lights? 
  • Will the smell of weed escape? 
  • Is this space secure? Can the public see my plants? 

Once you choose a location, clean the space with disinfectant to kill any pathogens that could be harmful to growing marijuana indoors. 

From there, you can start designing and planning your indoor grow room

Top advantages of growing weed indoors

Although growing marijuana outdoors might seem more natural, there are many advantages to cultivating indoors. Let’s take a look!

Ability to grow plants year-round

Most states in the US don’t have ideal climates for growing marijuana outdoors year-round. 

Growing marijuana indoors allows you to cultivate year-round because you can manage the environment with artificial heat, humidity, and lights. 

More control over growing conditions

With indoor grow rooms, you can easily manipulate the climate.

Some cannabis strains thrive better in cooler, less humid climates, while others need warmth with lots of lights. 

Keep an eye on the plants at all times

Growing marijuana indoors gives you the ability to monitor your weed plants at all times. Just walk over to your indoor grow room to see if all crops are healthy. 

With modern technology, you can change the temperature and humidity levels and turn on and off lights from your smartphone. 

Create a hygienic grow room

Growing marijuana indoors gives you the control to keep a clean space. Set up a station for sterilizing growing tools, and sweep the floors if dirt or water spills. 

An indoor grow room is protected from insects and wild animals who can bring diseases and kill your crops. 

Easier to control pollination of plants

If you’re using regular cannabis seeds, the male plants need to pollinate females to produce consumable marijuana. 

Cannabis plants pollinate through the wind, not through bees. Pollen is lost when growing outdoors, but with growing marijuana indoors, you can control the ventilation, so these particles don’t escape. 

Growing Marijuana Indoors

Ability to standardize the marijuana grown

With growing marijuana indoors, you can consistently maintain the same environment over and over again. It’s possible to have the same temperature, humidity levels, and ventilation in May and December. 

Ability to create new strains

One of the most exciting things about growing marijuana indoors is creating your own cannabis strains by breeding two different ones. 

It’s much easier to do this in an indoor grow room because, when extracting the pollen from male plants, you can shut off the ventilation, so there isn’t a breeze. You can bring that to the desired female plant and fertilize it. 

Easier to keep pests away from plants

Pests like cannabis aphids, Eurasian hemp borers, corn earworms, and hemp russet mites are the most damaging to outdoor marijuana plants. 

Growing marijuana indoors will protect your crops from these harmful pests. Make sure any vents or windows have screens, so these insects can’t get in. 

No one else can harvest the flowers

Indoor grow rooms have extra security because you can lock up your space, so even guests to your home can’t get a hold of your marijuana. 

Growing outdoors leaves your mature marijuana plants vulnerable for others to harvest, animals to eat, or pests to destroy. 

How to set up an indoor grow room

Now you know all of the advantages of growing marijuana indoors, you’re probably wondering what you need to buy to get started. 


As mentioned above, choosing the correct growing space is important. If it’s your first time growing marijuana indoors, start small. It’s easier to control the environment with a small grow room, and it’ll be more affordable. 


If the space tends to be cold, you might want to invest in some equipment. 

To grow successful marijuana crops, you need an environment between 65°F and 78°F. If an indoor grow room is too cold, it stunts the growth, which produces a lower, less potent yield. 

Humidity also plays a role in an indoor garden’s environment. During the seedling stage, the percentage of humidity needs to be at 70%. This level gradually reduces to about 40% as the plant matures. 


Marijuana grow lights are vital in growing marijuana indoors. When your cannabis crops are in the vegetative stage, they need 18 to 24 hours of light. As they mature, the lighting schedule changes to 12 hours of light and 12 hours of dark. 

Growing Marijuana Indoors

If you buy autoflower seeds, the lighting schedule isn’t critical because the plants will flower automatically, regardless of a change in lighting. However, more lighting can mean bigger yields.


Ventilation is another key factor when growing marijuana indoors. Air circulation is critical to managing temperature and humidity levels; also to help prevent mold and mildew build-up. 

If there isn’t a window in your indoor grow room, invest in a fan or carbon filter.

Odor control

Growing marijuana indoors is a stinky job, especially when the plants are in the flowering stage. The odor of cannabis is strong and can easily upset neighbors, children, and visitors. 

The best way to manage odor from the smell of marijuana is with a carbon filter. The particles get trapped in the filter and won’t exit the indoor growing room. 


To start growing marijuana indoors, you’ll need some essential tools to make your life easier. 

To name a few things, you’ll need different sized pots—consider growing weed in a bucket—plus soil, nutrients, water, pH reader, gloves, a small shovel, and most importantly, cannabis seeds. 

You can buy a variety of high-quality marijuana seeds at i49 Genetics.


Some weed laws state that your marijuana crops must be in a locked indoor grow room. This is also excellent to protect your harvest from nosy neighbors and potential thieves. 

Regulating temperature and humidity in your indoor grow space

Cannabis temperature and humidity are crucial factors to an indoor grow room. 

Growing Marijuana Indoors

When the temperature increases, the relative humidity will decrease, creating drier air. If the temperature decreases, the moisture level will rise.

Let’s take a look at how to regulate these factors of the indoor grow room’s climate.


During the colder months, you’ll need to have a heating system for your indoor grow room. You can use your central heating, or you can invest in a portable space heater. 

It’s vital you have a thermometer in your indoor grow room—more than one is a good idea to determine the temperature in all parts of the indoor garden. 

Heat rises, so the upper part of the room will be warmer than the floor. Also, the climate next to the space heater will be hotter than areas further away. 

When the indoor grow room is too hot, you also need a ventilation system to absorb the extra degrees. 


Marijuana plants like a humid climate to thrive in. You can add humidity to your indoor grow room with a humidifier. 

The correct cannabis humidity levels depend on the growth stage. This is important to keep in mind because if you have one plant in the flowering stage and you want to start a new seedling, you’ll need two separate indoor grow rooms. 

When the cannabis plant is immature, it requires a lot more moisture at around 70%, while during the flowering stage, the percentage of humidity is around 40%. 

You should invest in a hygrometer to help you determine the humidity level in your indoor grow room. 

When your indoor grow room is too humid, you can use the ventilation system to regulate it. There are also dehumidifiers, which work to eliminate unwanted moisture. 

Soil and other media for growing weed indoors

Growing cannabis in soil is the most popular material for growing marijuana indoors because it’s the most natural, making it easy to use and cheap to buy. It’s a great choice for first-time marijuana gardeners because you can buy soil with premixed nutrients. 

Perlite, made from volcanic rock, is another commonly used medium for growing weed indoors. It helps increase oxygen levels to the plant, doesn’t interfere with nutrients, helps produce strong roots, and is lighter than soil. 

Coco coir is made from coconut husks and functions very similarly to soil. Coco coir is a semi-hydroponic technique that gives roots direct access to water and nutrients. This results in faster-growing indoor weed.

Clay pellets, which are small round balls, can replace soil as a medium in growing weed indoors. Clay pellets are designed to be used with a hydroponic growing setup. These are easy to use and can be reused. 

Taking care of indoor cannabis plants

Let’s imagine you have your indoor grow room setup and are ready to go. Growing marijuana indoors isn’t a passive hobby.

Watering and nutrients

If you’re not using distilled H2O, make sure you test your tap water before using it for growing marijuana indoors. You might need to filter your water if there’s a lot of calcium, magnesium, or sodium. 

The watering schedule is dependent on some factors; the size of the plant, the humidity levels, the temperature, and what growth stage your marijuana plant is in. 

Growing Marijuana Indoors

A good rule to use is to water the plants when the growing material looks dry. This is usually every other day. 

Indoor weed plants need nitrogen, potassium, phosphorus, and some other minerals, to thrive while growing. Investing in nutrients that have been designed for weed plants is the best way to go. 

You should add nutrients to the water about once or twice a week. An excess of nutrients can cause just as many problems as a lack of them. 

Check for pests and mold

Once or twice a day, you should enter your indoor grow room to inspect your marijuana plants. 

Look for any pests flying around or on your cannabis plants and soil. If you see any, look for openings to see how they could have entered the indoor grow room. 

Next, look at your plants to see any discoloration, standing water, or mold. It’s vital to check on the bottom of the crops or where there are many bushy leaves. 

You can trim some branches, so there’s better airflow between plants and leaves. 


It’s essential to take good care of your equipment in your indoor grow room. Every time you use your tools, you should sterilize and clean them. 

If one crop is infected with a pathogen, your tools can pass it around your indoor grow room. Also, mold, mildew, and fungus can grow on dirty tools, which then damages your cannabis plants.  

FAQ related to growing marijuana indoors

Let’s look at some frequently asked questions to make sure everything is clear about growing marijuana indoors. 

How do you start the flowering process when growing marijuana indoors?

When using regular cannabis seeds, you need to see if the male plants are producing pollen and the female plants begin growing white pistils. 

You have to change the lighting schedule to 12 hours of light and 12 hours of dark. You also need to decrease the temperature and humidity in the indoor grow room. Naturally, your cannabis plants will start the flowering process. 

If you’re using autoflower seeds, the marijuana plant begins flowering at a certain point of maturity. These seeds are better for beginner home growers because it’s one less factor you have to be aware of. 

How to get max yields in small spaces?

To get the maximum yield in a small indoor grow room, make sure you invest in high-quality lights, the temperature is warm enough, and buy the best indoor strains known for bigger yields. 

How to make marijuana growing indoors not smell?

Some ways to control the odor of your indoor grow room are to use a carbon filter, an odor neutralizer, or an ozone generator. 

Also, buy marijuana seeds that don’t claim to have a potent smell. 

A final look at growing marijuana indoors

Growing marijuana indoors is becoming a popular hobby among users as it’s getting legalized in many US states.

Growing weed indoors does take a little work and investment, but after you harvest your first marijuana plant, all the time and effort will be worth it. 

What’s the wait? You know the information to start growing marijuana indoors; look to buy cannabis seeds at i49 Genetics today!