How to Grow Cannabis Indoors: A Beginner’s Guide

Growing cannabis yourself has a lot of benefits, but there are a few quintessential things to pay attention to when you start. Learn more about how to grow cannabis indoors.

How to grow cannabis indoor

Pick a space for growing

The first step to properly growing cannabis indoors is to pick a ‘grow’ room. This, however, does not necessarily has to be an actual room – it can be a grow tent, a closet, a cabinet, a spare room but whatever option you choose, you need to keep a few things in mind.

Keep good air circulation in mind

Air circulation is of great importance since your plants need to breathe just as much as you do. Avoid places limited with stale air. Consider buying fans and placing them strategically to ensure freshly circulated air.

Take smaller steps but plan big in advance

Most importantly – start out small. Most people make the mistake of choosing a bigger space than they need. Start with just one or two plants. You are bound to make some mistakes, so the fewer plants you waste, the less frustrated you will be.

However, once your plants start reaching full maturity and producing flowers, you will be amazed how they double or even triple in size. Here comes the vertical height factor. It will be best if there is vertical space in your grow ‘room’ for when the plants are in their vegetative stage. It is not a vital error if the vertical space is limited but you will need to carefully crop and prune your plants.

Keep it clean

Of course, your space needs to be sanitized and easy to clean, so avoid carpets, drapes, raw wood, etc. When growing inside, you can control all the surrounding factors, so establish a cleaning routine. Be advised, though, that you don’t need to use any kind of cleaning supplies – all you need is a web microfiber cloth to wipe the surround areas.

Shut the lights

During dark periods light can confuse your plants and they can start producing male flowers, so keep your space light-sealed.

Other factors

Pick a convenient place which is safe and easy to get to, so that you will be able to monitor your plants every day.

Pay attention to the temperature, and again, if it is too warm, invest in a fan.

And remember – this is your space, so pick a private one. This applies even in places where growing cannabis is legal. The fewer people know, the better.

Cannabis Grow Lights

Outdoor growing plants use the energy from the sunlight and can grow to the size of a tree in less than a year but when you grow marijuana indoors, your lighting is your number one priority. It is a good idea to invest in the best lighting option you can afford. There are a few good options for a grow light.

LED Grow Lights

The LED (light emitting diode) lights are proven to be the best option for marijuana growers. LED lights are highly efficient, require less electricity, create much less heat, and contain more wavelengths across the light spectrum, which leads to better quality plants.

However, they are more expensive than the fluorescent and the HID grow lights.

Fluorescent Grow Lights

As we mentioned, the compact fluorescent lamps or CFLs are significantly cheaper and easier to use than the other options. They do not generate a great amount of heat and provide enough light to keep your plant in a vegetative state. They are less efficient than the other options but they are a good option for novice inside growers who are not certain that they will stick to growing inside.

HID Grow Lights


The HID (high-intensity discharge) lights can be either an HPS (high-pressure sodium) or MH (metal halide). The two main types differ in terms of the stage that they should be used in. MH bulbs should be used during vegetative growth, while HPS bulbs are a better option for the mature flowering stage.

However, it is not necessary to get both types of lamps – if you want to save some money and only get one, make sure you choose HPS as they are a bit more efficient.

Induction Grow Lights


Induction lamps are an old technology invented by Nikola Tesla in the late 1800s and they represent a more efficient version of the fluorescent lamps.

Pick a Grow Medium and Nutrients

Growing indoors means you will have different options for choosing a medium. The most popular are the following.


The most popular one is soil. It is simple, traditional and suitable for first-time growers. Any high-quality potting soil is good but it doesn’t contain artificial extended release fertilizer which is unsuitable for growing good cannabis.

Coco coir fiber

This is a soilless mixture which is recycled and processed natural fiber from coconut husks. Its pH makes it comparable to the unfertilized soil. Many growers combine coco and soil as a mix.


This means that all of the plant’s nutrient needs are supplied through highly oxygenated, nutrient enriched water. The plant spends less energy growing roots and searching for nutrients, and uses more energy for growth and flowering.


Watering determines your plant growth and development. Plants in the mature flowering stage require more watering than plants in the vegetative stage. There is no exact rule of how much your plants should be watered but overwatering is an easy mistake. One primary symptom of overwatering is dropping leaves. A similar symptom can be noticed in underwatered plants – the leaves are also dropping but they look wilted.

Author’s Bio:

Luis RiveraLuis Rivera: Luis has 20+ years of experience in the global market expansion, business development, mergers and acquisitions, business re-engineering, finance and investor relations of software companies. He is passionate about technology, spectral science, indoor farming, food production, automation, and more. Since 2015 he is the president of Advanced LED Lights, a leading LED grow lights manufacturer based in Hiwasse, Arkansas. When not at work, Luis enjoys swimming, yoga, as well as growing grapes and flowers in Sonoma, California.

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