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what you need to grow weed indoors cheap

How to build an indoor cannabis garden on a budget

Setting up an indoor weed grow in your home is a lot easier than you may think. You will need to invest some time and money into an indoor grow, but acquiring materials and building it out doesn’t require a lot of skill and can be done cheaply.

This guide will show you how to build three different garden setups at three different price points. Each build below contains all necessary components needed to create a simple, climate-controlled grow for your plants.

All of the hardware used for each project can be ordered online or bought at a local hardware store or grow shop.

Note: Product prices below may fluctuate slightly over time.

The nano grow: $115 to $150

Who should use this build?

First-time growers, budget growers, and those who wish to keep their garden as inconspicuous as possible are a good fit for the Nano Grow. At 24”x 24”, this tent is small enough to fit in most closets.

Supply list:

  • TopoLight 24”x24”x48” Indoor Grow Room ($50)
  • Lorell 6” Clip On Fan ($14)
  • Century 24 Hour Mechanical Timer ($10)
  • Growstar 150w Cree LED Full Spectrum UFO Light ($43)
  • (Optional) iPower 4” 100CFM Inline Duct Fan ($18)
  • (Optional) AcuRite Hydrometer and Thermometer ($12)

Total cost: $117-147

The Nano Grow is designed to be the most budget friendly and least technical design. This build focuses on trimming down the necessary components to eliminate any superfluous items. While the essentials will cost you just under $120, you can add an optional inline fan and thermometer/hydrometer for just bit more.

LED lights work well in this environment because they produce very little heat. Although filtration for a grow of this size is not necessary, those who wish to grow in a more confined space should consider opting for the intake fan and thermometer/hydrometer. This will help to both increase air circulation and provide some fundamental metrics for maintaining a healthy environment for the plants.

With the tent height maxing out at 48”, plants grown in this space should not exceed 24” in height and we recommend using dwarf, indica, and auto-flowering varieties for best results.

Build notes:

30 min

  • Hardware recommendations: Duct tape, heavy-duty zip ties
  • Total power outlets required: 2 to 3
  • Where to assemble: Closet space or room
  • Recommended plant count: 1 to 2 plants
  • Components:

    • Tent: The Topolight grow tent is perfect for a small space or closet and features highly reflective mylar coating on the inside to help provide your plants with optimal lighting.
    • Light: The Growstar LED Full Spectrum UFO Light is an inexpensive and efficient fixture designed to provide a spectrum suitable for both vegetative and flowering plants. This light features 30w of Cree LED and emits a blue/purple hue. You also receive the necessary components to hang the light at variable heights in order to follow a canopy as it grows. LED lights do not add any additional heat to the tent and require less filtration to maintain proper temperatures.
    • Filtration: A 6” Lorell clip-on fan provides airflow within the tent. Additionally, you may add a 4” 100CFM inline duct fan to provide an intake mechanism to cycle clean air throughout the tent. If you decide to buy the intake duct fan, install it on the bottom of the tent using duct tape and zip ties. The clip-on fan will help move air around inside of the tent. By keeping the top duct port open, air may exhaust passively. If you decide to opt out of the intake duct fan, leave both the bottom and the top port open for air movement.
    • Automation: This build comes with a 24-hour mechanical timer designed to keep the light on an automated cycle. Mechanical timers are slightly more affordable than their digital counterparts.
    • Climate metering: The basic version of this build does not feature any climate monitoring hardware. However, there is an option to purchase an Acurite thermometer/hydrometer which will allow you to monitor essential metrics within the tent.

    The micro grow: $500

    Who should use this build?

    The Micro Grow is a value-driven package designed to provide all of the essentials for a single tent grow. More advanced than the Nano Grow, it’s a complete system that can handle just about any grow style.

    This build is a perfect fit for a small room or garage space. At 64” tall, the tent affords enough room to propagate most smaller, bushier cultivars. There is a canopy height limit of between 35” and 42”.

    In this setup, 2 to 4 plants are recommended. You can squeeze in 6 plants if you grow small auto-flowering varieties and/or vegetate the plants for less time.

    Supply list:

    • Casolly 32”x32”x64” Indoor Grow Room ($65)
    • Century 7 Day Heavy Duty Programmable Digital Timer, Dual Outlet ($13)
    • AcuRite Hydrometer and Thermometer ($12)
    • Lorell 6” Clip-On Fan ($17)
    • Growsun 4” Indoor Grow Exhaust Kit, Carbon Filter, Fan, Ducting ($120)
    • VivoSun 6” 240CFM Inline Duct Booster Fan ($21)
    • Growneer Variable Speed Vent Fan Controller ($12)
    • TopoGrow 315W CMH Grow Light Kit, 120v fixture w/ 3100k Bulb ($177)
    • 15 amp GFCI Grounded 5-Outlet Adapter ($29)

    Total cost: $466

    Unlike the Nano Grow, this build contains a complete ventilation system designed to filter and exhaust hot air while simultaneously bringing in clean, cool air. Additionally, the timer has been upgraded to the dual-outlet digital model for controlling both the light and carbon filter exhaust system. A variable speed vent fan controller is also added for maximum climate control.

    With the 315w CMH (ceramic metal halide) lights, enough heat is generated to recommend this build for an open space to allow for the best possible air circulation through the tent. The included 3100k bulb allows you to use the tent for both vegetative and flowering cycles.

    Build notes:

    1 hour

  • Hardware recommendations: Duct tape, heavy-duty zip ties
  • Total power outlets required: 4 (5-outlet grounded adaptor recommended)
  • Where to assemble: Room or garage
  • Recommended plant count: 2 to 4 plants
  • Components:

    • Tent: The Casolly 32”x32”x64” Indoor Grow Room provides adequate space for a much more powerful fixture, allowing you to cultivate more plants than the Nano Grow. This tent also features multiple ducting ports for proper air ventilation systems to be installed and comes with a front-sided concealable window for easy monitoring.
    • Light: This build features a 120v 315w CMH light fixture from TopoGrow. CMH lights give off far less heat than HID fixtures such as high-pressure sodium (HPS) and metal halide (MH). Complete with a 3100k bulb, this fixture produces a light spectrum conducive to both vegetative and flowering plants, eliminating the need to switch lights between cycles. Even better, this CMH fixture comes with a built-in ballast.
    • Filtration: Although CMH fixtures produce less heat than their competitors, there’s still a need for proper ducting and ventilation to remove hot air from the tent. For this build, we chose to pair a Growsun 4” indoor exhaust kit with a 6” Vivosun 240CFM inline duct booster fan. To maintain proper ventilation, a fan speed adjuster has been added. Additionally, a 6” Lorell clip-on-fan is used for airflow over the plant canopy.
    • Automation: A dual outlet digital timer is included for tandem use with the carbon filter exhaust and light fixture.
    • Climate metering: The Acuright Digital thermometer/hydrometer will help monitor temperature and humidity levels within the tent, making climate control adjustments easier.
    • Filtration setup: The 315w CMH generates enough heat to require filtration from the top of the tent. Airflow should be directed upward by installing the 6” duct booster fan at the bottom of the tent using duct tape and zip ties with the 4” carbon filter exhaust system at the top. Use heavy-duty zip ties to fasten the carbon filter at the back of the tent. Duct tape may be used to attach the fan to the filter as well as the filter to the aluminum ducting. Guide the ducting through the top port and fasten it with zip ties and duct tape.

    With this system, cool air will enter through the bottom of the tent, and warm air will be scrubbed as it leaves the top of the tent. The 6” clip-on fan should be placed just above canopy level on the back-left pole to help circulate air evenly as the plants mature.

    Standard grow: $1,000

    Who should use this build?

    The Standard Grow offers a complete package for growers who wish to maintain a perpetual cultivation operation year-round. It covers all of the essentials in housing, lighting, automation, and filtration for a standard home grow.

    No matter what your legal plant limit is, this tent should be able to handle it. At 80” for the main grow chamber, height is not a problem, and just about any cultivar can be propagated successfully under this build. With a 630w 3100k CMH fixture, this room can be used for both vegetative and flowering stages.

    For growers who want a full system capable of germinating seedlings, taking and keeping clones, maintaining mother plants, and have multiple chambers for various projects, this is the build for you.

    However, this system tends to run hot and will need the open air of a large room or garage to function optimally.

    Supply list:

    • 4 Bulb t5 Grow Light Fixture (x2 at $75)
    • GrowSun 6” 400 CFM Indoor Grow Exhaust Kit, Carbon Filter, Fan, Time, Ducting ($120)
    • TopoGrow 630W CMH Grow Light Kit, 120v Fixture w/ 2 3100k Bulbs ($320)
    • AcuRite Hydrometer and Thermometer (x2 at $12)
    • VivoSun 6” 240CFM Inline Duct Booster Fan (x2 at $21)
    • Lorell 6” Clip-On Fan (x4 at $17)
    • Century 7 Day Heavy Duty Programmable Digital Timer, Dual Outlet (x2 at $13)
    • TopoGrow 2-in-1 60”X48”X80” Dual Room Indoor Grow Tent ($188)

    Total cost: $938

    The “Standard Grow” is designed to be a fully comprehensive cannabis cultivation and propagation system, offering an all-inclusive perpetual grow space packed into a 4×5’ build. For just under $1,000, you get a 3-chambered, 3-light tent with a full air filtration system, automation and metering included.

    This build allows growers to cultivate at multiple stages in the plant’s life cycle as well as provide housing for multiple propagation projects.

    The 4×4’ main tent is powered by a 630w CMH light and the 1×4’ two-tiered tent extension is built out with two 4-bulb t5 fluorescent light fixtures. Complete with four fans, two dual outlet timers, and adjustable intake/exhaust components, this 80” tent supports even the most ambitious of grows.

    Build notes:

    2 hours

  • Hardware recommendations: Duct tape, heavy-duty zip ties
  • Total power outlets required: 10 (two 5-outlet grounded adaptors recommended)
  • Where to assemble: Room or garage
  • Recommended plant count: 4 to 12 (flowering)
  • Components:

    • Tent: The shining star of this build is the TopoGrow 2-in-1 60”x48”x80” dual-room indoor grow tent. The main chamber is 4’x4’x6.6” with an attached 1’x4’x6.6” two-tiered chamber. A wire frame separates the two chambers, allowing for two separate propagation rooms. The main and second chambers of the tent are divided by a velcro applied detachable, double-ended mylar fabric barrier.
    • Light: This system contains three separate light fixtures. The main room is outfitted with a 120v 630w CMH fixture with double 3100k bulbs, while the two-tiered chamber contains a pair of 12”x48” t5 fluorescent light bulb fixtures (4-bulb) stacked vertically. With this build, the main chamber may be used for both late vegetative and flowering cycles while the side chambers make for fantastic germination and cloning areas for young vegetative plants.
    • Filtration: The main chamber of the tent comes with a complete air filtration system. The intake is one 6” inline duct booster fan fastened at the bottom of the tent. A second 6” booster fan removes hot air from the top of the tent and sits just left of the CMH fixture. For exhaust, a 400CFM kit from GrowSun is used. The kit contains a 6” carbon filter, heavy-duty duct exhaust fan (with a speed controller), as well as 6” aluminum ducting. This system may either be fastened to the top back end of the tent via heavy-duty zip ties and duct tape or placed on the ground in the back right corner of the tent. Each set-up allows for exhaust ducting to leave the same top port. The main room receives two 6” clip-on fans, one set up to canopy height and the second fastened to a top support beam directing air towards the light fixture and 6” exhaust fan. The two-tiered side chamber gets a 6” clip-on fan for each room.
    • Automation: Two Dual Outlet Century 7 digital timers are used in this build. One controls the light and exhaust fan in the main chamber and the other controls the two fluorescent lights on the side.
    • Climate metering: Each chamber receives one Acurite hydrometer/thermometer for climate metering.
    • Filtration setup: For the main room, fasten the first 6” booster fan to the bottom-left port of the tent with zip ties and duct tape, directing air inward. The second booster fan should be fastened in the same way on the top-left side of the tent above the first. This fan will direct air out of the tent.

    The 6” exhaust kit may either be fastened on the top of the left tent or on the bottom-right, each option directing air through the carbon filter and out of the top port. This room receives two 6” clip-on fans—the first will be fastened to the top-right support beam of the tent to help move warm air towards the exhaust. The second fan can be placed on the back-left corner to follow the canopy as it rises.

    For the second room, a 6” clip-on fan is fastened to the back-left support beam of each tier to direct airflow throughout each small chamber.

    Author’s notes:

    • All prices are factored in pre-tax/pre-shipping fees.
    • Pricing and availability are subject to change.
    • Although not included in the inventory list, it is highly recommended that you purchase both 4” and 6” protective screens for each booster fan. Though not available on Amazon currently, these can be purchased at most hardware stores.

    Patrick Bennett contributed to this article.

    Check out Leafly's guide to learn some tips and tricks on how to set up an indoor weed grow inexpensively.

    How to grow marijuana indoors: a beginner’s guide

    Congratulations, you’re interested in growing your own cannabis plants for the first time! But before you flex that green thumb of yours, understand that growing marijuana indoors presents a unique set of challenges for the new hobbyist, and the sheer volume of information available on the subject can be overwhelming.

    Our clear, easy-to-digest guide to indoor growing will help even first-time growers get started.

    Jump to a section:

    Self-isolating? Order cannabis online with Leafly Pickup or Delivery

    Benefits of growing weed indoors

    • High-quality weed: Although it’s more resource-intensive than growing outdoors, you can control every aspect of your environment and what you put in your plant, so growing indoors will allow you to dial in your setup to grow some primo weed.
    • Adaptability: Live in an apartment or a small house? You can grow weed practically anywhere, even folks who don’t have a backyard or a lot of extra space.
    • Multiple harvests: Unlike outdoor growing, you aren’t tied to the sun and the seasons. You can let your plants get as big as you want, flip them into flower, harvest, and then start another batch right away. You can grow whenever you want, even straight through winter.
    • Privacy and security: Even in legal states, you may want to conceal your crop from judgmental neighbors and definitely from potential thieves. Growing indoors allows you to grow discreetly behind a locked door.

    Step 1: Designate a cannabis grow room or space

    The first step in setting up your personal cannabis grow is creating a suitable space in which to do it. This space doesn’t even need to be a typical room—it can be 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.

    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
    • 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 cannabis growers will experience setbacks and lose plants to pests or disease. A failed grow of two plants will put a far smaller dent in your wallet than a lot more 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. You’ll also have to leave enough room for you to work. Cannabis plants can double in size in the early stages of flowering, so make sure you have adequate head space!

    If your grow room is a cabinet, tent, or closet, you can simply open it up and remove the plants to work on them; otherwise, you’ll need to make sure you leave yourself some elbow room.

    Cleanliness is crucial

    Make sure your space is easily sanitized; cleanliness is important when growing indoors, so easy-to-clean surfaces are a must. Carpeting, drapes, and raw wood are all difficult to clean, so avoid these materials if possible.

    Keep it light-tight

    Another crucial criterion 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:

    • Convenience: 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 very 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, so be sure to pick a place where noisy fans won’t garner any unwanted attention.

    Step 2: Choose your cannabis grow lights

    The quality of light in your grow room will be the number one environmental factor in the quality and quantity of your yield, so it’s a good idea to choose the best lighting setup you can afford.

    Here’s a brief rundown of the most popular types of cannabis grow lights used for indoor growing.

    HID grow lights

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

    The two main types of HID lamp used for growing are:

    • Metal halide (MH), which produce light that is blue-ish white and are generally used during vegetative growth.
    • High pressure sodium (HPS), which produce light that is more on the red-orange end of the spectrum and are used during the flowering stage.

    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 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 electromagnetic 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 (HO) T5 bulbs, are quite popular with small scale hobby growers for the following reasons:

    • 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

    The main drawback is that fluorescent lights are less efficient, generating about 20-30% less light per watt of electricity used. Space is another concern, as it would require approximately 19 four-foot long T5 HO bulbs to equal the output of a single 600 watt HPS bulb.

    LED grow lights

    Light emitting diode (LED) technology has been around for a while, but only recently has it been adapted to create super efficient light fixtures for indoor growing. 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 LEDs last much longer, use far less electricity, create less heat, and the best designs generate a fuller spectrum of light, which can lead to bigger yields and better quality.

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

    Induction grow lights

    Induction lamps, otherwise known as electrodeless fluorescent lamps, are another old technology that has been recently adapted to suit the needs of indoor growers. Invented by Nikola Tesla in the late 1800s, 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 (CO2) 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 comfortable range for your plants, between 70-85°F when lights are on and between 58-70°F when they are off. Some varieties of cannabis (generally indica strains) prefer the colder 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. People who live in warmer regions will often run their lights at night in an effort to keep temperatures in their grow down.

    It’s advisable 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. This will allow you to choose an exhaust fan suitable for your needs. If the odor of cannabis plants in bloom will cause you problems, add a charcoal filter to your exhaust fan.

    Alternately, you can create a sealed, 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 point it directly at your plants, because that can cause windburn.

    Step 4: Pick your climate controls and monitors

    Once you have selected your lights and climate control equipment, you’ll want to automate their functions. While there are sophisticated (and 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.

    The timing of the light/dark cycle is very important when growing cannabis; generally you will have your lights on for 18 hours per 24 hour period while the plants are in vegetative growth, then switch to 12 hours of light per 24 hour period 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, so a timer is essential. You can use a timer for your exhaust fan as well, but spending a few extra dollars on a thermostat switch is a much better option.

    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 steady temperature.

    Since you’re probably not spending most of your time in your grow space, a combination hygrometer/thermostat with high/low memory feature can be very handy in keeping tabs on conditions in your room. These small, inexpensive devices not only show you the current temperature and humidity level, but the highest and lowest readings for the period of time since you last checked.

    Step 5: Decide on a cannabis grow medium

    Growing indoors means you have many different media to choose from, and whether it’s good old fashioned pots full of soil or a rockwool slab 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 unsuitable for growing good 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 other components with a good soil and letting it sit for a few weeks, or it can be purchased pre-made from a few different suppliers.

    As with all organic growing, this method relies on a healthy population of mycorrhizae and soil bacteria to facilitate the conversion of organic matter into nutrients that are useable to the plant. Alternately, you can use a regular soil mix and then supplement your plants with liquid nutrients as the soil is depleted.

    Soilless (aka 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 lockout and burn.

    Different materials used include rockwool, vermiculite, expanded clay pebbles, perlite, and coco coir, just to name a few. Commercial soilless mixes are widely available that combine two or more of these media to create an optimized growing mix. Soilless media can be used in automated hydroponic setups or in hand-watered individual containers.

    Step 6: Pick a container

    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, 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:

    • Calcium
    • Magnesium
    • Iron
    • Copper

    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.

    It’s important to get a pH meter so you can check the pH level of your water when mixing nutrients. 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 regularly and make sure the nutrient mix you are feeding your plants falls within the desired range.

    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 the specific strains you grow, but this article will give you a solid foundation of knowledge to get started on the right foot.

    And remember, growing marijuana is a labor of love, so spend a lot of time with your plants and have fun!

    This post was originally published on June 6, 2016. It was most recently updated on April 2, 2020.

    Our indoor cannabis growing guide will help simplify the process for you into clear, easy-to-digest sections to help the first-time grower get started.