Cannabis growing 101

How to Grow Indoors: A guide for Beginners.

So you’re interested in growing your own cannabis plants for the first time? But before you flex those sticky green cannabis thumbs, understand that growing indoors has a unique set of challenges for first-timers, and the sheer volume of information available on the subject can be completely overwhelming. So, without further ado here’s a guide to indoor cannabis growing that should help simplify the process to help you get started.

Step 1: Designate a Grow “Room/or Space”

The first step in setting up your personal grow is too creat a suitable space in which to do it. This space doesn’t need to be the typical grow “room; it can be in a closet, tent, cabinet, spare room, or a corner in an unfinished basement. Just keep in mind that you’ll need to tailor your equipment (and plants) to fit the space.

Be humble and Start Small…

When tackling your first grow project, you’ll want to start small for multiple reasons.
The smaller the grow, the less expensive it is to set up, plus It’s much easier to monitor a few plants than a large number. Your mistakes as a first-time grower will be less costly. Remember, most new growers will experience some setbacks and lose plants to pests or disease. A failed grow of two plants will put a far smaller dent in your wallet than 15 plants.

…But Think Big

When designing your space, you’ll need to take into account not only the amount of room your plants will need, but also your lights, ducting, fans, and other equipment, as well as leaving enough room for you to work. Cannabis plants can double, even tripling in size during the early stages of flowering, so make sure you have plenty of space! If your grow room is a tent, closet, or  plastic trap walls, you can simply open it up and remove the plants to work on them; otherwise, you’ll need to make sure you leave yourself enough elbow room.

Clean, then clean again,

Make sure your space is easily sanitized; cleanliness is important when growing indoors, so surfaces that can be cleaned easily, is a must. Carpeting, drapes, and raw wood are all difficult to clean, avoiding these materials if possible would save a lot of potential headaches in the future.

Keep the Light out,

Another critical part for a grow room is that it be light-tight. Light leaks during dark periods will confuse your plants and can cause them to produce male flowers.

Other Variables When deciding where to grow your cannabis, keep the following variables in mind.


You’ll need to monitor your plants carefully. Checking on them every day is important, and beginners will want to check in several times per day until they have everything dialed in. If your room is hard to access, this crucial step will be difficult.

Temperature and Humidity Concerns.

 If your grow space is already warm or very humid, you’ll have issues controlling your grow environment. Choosing a cool, dry area with ready access to fresh air from the outdoors is highly recommended.

Stealth — You’ll most likely want to conceal your grow from nosy neighbors and potential thieves.You wouldn’t want all your hard work to be a waste.

Step 2: Choose Your Cannabis Grow Lights:

The quality of light in your grow room will be the number one factor in the quality and quantity of your plants yield, so it’s a good idea to choose the best lighting setup that’s within your budget. Here’s a brief rundown of the most popular types of grow lights used for indoor growing.

(High intensity discharge), lights are the industry standard, widely used for their combination of output, efficiency. They cost a little more than incandescent or fluorescent, but produce far more light per unit. Conversely, they are not as efficient as LED lighting, but they cost as little as one-tenth as much.

The two main types of HID lamps used for growing:

(Metal halide), which produce light that has a blueish-white and are generally used during vegetative growth.

(High pressure sodium), which produce light that is more on the reddish-orange that are used during the flowering stages.

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.

If you can’t afford both MH and HPS bulbs, start with HPS as they deliver more light per watt. Magnetic ballasts are cheaper than digital ballasts, but run a lot hotter, are less efficient, and harder on your bulbs. Digital ballasts are generally a better option, but are more expensive. Beware of cheap digital ballasts, as they are often not well shielded and can create interference that will affect radio and WiFi signals.

Unless you’re growing in a large, open space with a lot of ventilation, you’ll need air-cooled reflector hoods to mount your lamps in, as HID bulbs produce a lot of heat. This requires ducting and exhaust fans, which will increase your initial cost but make controlling the temperature in your grow room much easier.

Fluorescent Grow Lights,

Fluorescent light fixtures, particularly those using high-output T5 bulbs, are quite popular with small scale hobby The main drawback with fluorescent lights are less efficient, generating about 30% less light per watt of electricity used.

Plus they tend to be cheaper to set up, as reflector, ballast, and bulbs are included in a single package.

They don’t require a cooling system since they don’t generate near the amount of heat that HID setups do

LED Grow Lights,

(Light emitting diode) has been around for a long time, but the main drawback to LED grow lights is their cost: well designed fixtures can cost 10 times what a comparable HID setup would. The benefits are that LED last much longer, use far less electricity, create less heat, and the best designs generate a fuller spectrum of light, which give bigger yields and better quality.

Unfortunately, there are many crummy LED lights being marketed towards growers, so do some research and read product reviews before spending your hard-earned cash.

Induction Grow Lights,

Induction lamps, otherwise known as electrodeless fluorescent lamps, are another old technology  that’s suited for the needs of indoor growers. The induction lamp is essentially a more efficient, longer-lasting version of the fluorescent bulb. The main drawback of these fixtures is their price and availability.

Step 3: Give Your Cannabis Plants Air,

Plants need fresh air to thrive, and carbon dioxide is essential to the process of photosynthesis. This means you will need a steady stream of air flowing through your grow room, easily achieved by means of an exhaust fan placed near the top of the room to remove the warmer air, and a filtered air inlet on the opposite side near the floor.

You’ll need to ensure that temperatures remain within a range for your plants, between 70 degrees F and 85 degrees F when lights are on and between 58 degrees F and 70 degrees F when they are off.  (generally indica strains) prefer the lower side of the range, while others are more tolerant of higher temperatures.

The size of your exhaust fan will depend on the size of your grow space and amount of heat generated by your lighting system. HID systems put out a ton of heat, especially if they aren’t mounted in air-cooled hoods.

It’s a good idea to set up your lights, turn them on for a while, and then determine how much airflow you’ll need to maintain a comfortable temperature for your plants, plus If the odor of cannabis plants in bloom will cause you problems, add a charcoal filter to your exhaust fan.

you can create a artificial environment by using an air conditioner, dehumidifier, and supplemental CO2 system, but this is quite expensive and not recommended for the first-time grower.

Finally, it’s a good idea to have a constant light breeze in your grow room as this strengthens your plants’ stems and creates a less hospitable environment for mold and flying pests. A wall-mounted circulating fan works well for this purpose — just don’t direct it at your plants, that could cause windburn.

Step 4: Monitoring your plants,

Once you have selected your lights and climate control equipment, you’ll want to automate their functions. While there are sophisticated (expensive) units available that control lights, temperature, humidity, and CO2 levels, the beginner will generally need a simple 24 hour timer for the light and an adjustable thermostat switch for the exhaust fan.

Timing the light/dark cycle is very important when growing cannabis; generally you’ll want your lights on for 16 hours per 24 hour cycle, while the plants are in vegetative growth, then switch to 12 hours of light per 24 hours when you want them to bloom. You need your lights to turn on and off at the same times every day or you risk stressing your plants out. You can use a timer for your exhaust fan as well.

With the most basic models, you simply set the thermostat on the device to the maximum desired temperature for your space and plug your exhaust fan into it. Once the temperature rises to the level you set, it will turn the fan on until temperatures fall a few degrees below the set threshold. This saves energy and maintains a nice steady temperature.

It’s also a good idea to keep a pH meter or test kit on hand so you can check the pH level of your water, nutrient solution, or soil. Cannabis prefers a pH between 6 and 7 in soil, and between 5.5 and 6.5 in hydroponic media. Letting the pH get out of this range can lead to nutrient lockout, meaning your plants are unable to absorb the nutrients they need, so be sure to test your water and soil regularly.

Step 5: Cannabis Grow Medium,

Growing indoors means you have many different methods to choose from, and whether it’s good old fashioned pots full of soil or a rockwool grow cubes in a hydroponic tray, every medium has its benefits and drawbacks. Here we’ll examine the two most popular methods and the media they employ.


Soil is the most traditional medium for growing cannabis indoors, as well as the most forgiving, making it a good choice for first-time growers. Any high quality potting soil will work, as long as it doesn’t contain artificial extended release fertilizer (like Miracle Gro), which is a BIG, no no for growing cannabis.

A very good choice for beginners is organic pre-fertilized soil (often referred to as “super-soil”) that can grow cannabis plants from start to finish without any added nutrients, if used correctly. This can be made yourself by combining worm castings, bat guano, and letting it sit for a few weeks, or it can be purchased pre-made.

Soilless ( Hydroponics)

Indoor growers are increasingly turning to soilless, hydroponic media for cultivating cannabis plants. This method requires feeding with concentrated solutions of mineral salt nutrients that are absorbed directly by the roots through the process of osmosis. The technique for quicker nutrient uptake leading to faster growth and bigger yields, but it also requires a higher order of precision as plants are quicker to react to over or underfeeding and are more susceptible to nutrient burn and lockout.

Step 6: What to Grow Your Cannabis In:

What type of container you use will depend on the medium, the system, and the size of your plants. A flood-and-drain, tray-style hydroponic system may use small net pots filled with clay pebbles or just a big slab of rockwool to grow many little plants, while a “super-soil” grow may use 10 gallon nursery pots to grow a few large plants.

Inexpensive options include disposable perforated plastic bags or cloth bags, while some choose to spend more on “smart pots,” containers that are designed to enhance airflow to the plant’s root zone. Many people grow their first cannabis plants in five gallon buckets. Drainage is key, though, as cannabis plants are very sensitive to water-logged conditions, so if you repurpose other containers, be sure to drill holes in the bottoms and set them in trays.

Step 7: Feed Your Cannabis Plants Nutrients:

Growing high-quality cannabis flowers requires more fertilizer, or nutrients, than most common crops. Your plant needs the following primary nutrients (collectively known as macronutrients):

-Nitrogen (N)
-Phosphorus (P)
-Potassium (K)

These micronutrients are needed as well, albeit in much smaller quantities:


If you aren’t using a pre-fertilized organic soil mix, you will need to feed your plants at least once a week using an appropriate nutrient solution. These nutrients are sold in concentrated liquid or powder form meant to be mixed with water, and generally formulated for either vegetative or flower (“bloom”) growth. This is because cannabis has changing macronutrient requirements during its lifecycle, needing more nitrogen during vegetative growth, and more phosphorus and potassium during bud production.

Most macronutrients are sold in a two-part liquid to prevent certain elements from precipitating (combining into an inert solid that is unusable by the plant), meaning you’ll need to purchase two bottles (part A and part B) for veg, and two bottles for grow, as well as a bottle of micronutrients. Other than these basics, the only other nutrient product you may need to purchase is a Cal/Mag supplement, as some strains require more calcium and magnesium than others.

Once you’ve purchased the necessary nutrient products, simply mix them with water as directed by the label and water your plants with this solution. You should always start at half-strength because cannabis plants are easily burned. It’s almost always worse to overfeed your plants than to underfeed them, and over time you will learn to “read” your plants for signs of deficiencies or excesses.

Step 8: Water Your Cannabis Plants:

Most people won’t think twice about the water they use on their plants; if you can drink it, it must be fine, right? Well, it may not be an issue, depending on your location, but some water contains a high amount of dissolved minerals that can build up in the root zone and affect nutrient uptake, or it may contain fungus or other pathogens that aren’t harmful to people but can lead to root disease.

Additionally, some places may have high levels of chlorine in the water supply, which can be harmful to beneficial soil microbes. For these reasons, many people choose to filter the water they use in their gardens.

The most important thing to remember during this phase is to not overwater. Cannabis plants are very susceptible to fungal root diseases when conditions are too wet, and overwatering is one of the most common mistakes made by the beginning grower. How often you water your plants will depend on the medium used, size of the plants, and ambient temperature. Some people will wait until the lower leaves of the plant start to droop slightly before watering.

As you gain experience and knowledge, you will alter your grow room and equipment to better fit your particular environment, growing techniques, and for the specific strains you choose, but hopefully this article will provide you with a solid foundation of knowledge to get started on the right foot. And remember, growing cannabis is a labor of love, so spend a lot of time with your plants and have fun!



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