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Growing weed indoors for beginners is easier than most think. All you need are high-quality seeds or clones and a climate-controlled room. Caring for your cannabis plants indoors can be accomplished on a budget and in small spaces

Ready to start your indoor cannabis garden? Here’s how!

How Long Does It Take to Grow Weed Indoors?

Weed plants grow at different speeds, but usually, plants can grow fully within a few months. Generally, cannabis plants take about three to four months to mature, although autoflowering strains can grow in under three months.

What You Need to Learn for Growing Weed Indoors for Beginners

Cannabis plants require proper care and maintenance from seed to harvest.

Here’s what you’ll need to grow indoor marijuana.

Seeds and Clones

Will you be starting your garden with seeds or clones? For beginners, we recommend using feminized seeds over regular seeds since feminized ones only produce flowering plants, not male pollinating plants. Autoflowering strains can be a good option, too.

If you’d rather skip the germination phase, you can start your garden with a cannabis clone derived from a healthy, vegetative mother plant. Cannabis clones are branch cuttings that feature the same genetics as their mother plant.

Grow Space Location

Cannabis plants can be grown in any free space in your home. We recommend investing in a small grow tent to provide your plants with a climate-controlled grow space to thrive. Grow tents come in various shapes to accommodate small or large gardens.


weed plant under lighting

Growing marijuana indoors means you need to provide your plants with plenty of light. We recommend light-emitting diode (LED) lights over fluorescent or HID grow lights. While LEDs may have a slightly higher upfront cost, they run cool, use less heat, provide energy savings, and have a higher light intensity. 

Air Circulation and Ventilation

A small oscillating fan in your grow tent or grow room can provide your plants with the right amount of air flow to reduce humidity and strengthen their structure. Air circulation and an intake and exhaust fan can bring in the fresh air and take out stale air.

Growing Medium

We recommend using soil over a soilless medium in a hydroponic system for beginners. Pre-made soil mixes with organic nutrients are an excellent way to start your garden. Soil-based systems can be more affordable and require less maintenance than hydroponic systems.


Cannabis containers should provide proper drainage, space for roots, and air circulation. Fabric pots are great options for beginners. A one-gallon pot should be good for a young plant. Transfer to a larger container size as needed.


Learn How To Grow Cannabis!


Beginners can feed their plants nutrient solutions from reputable brands based on the manufacturer’s feeding schedule. We recommend feeding the plant 25 percent of the recommended amount and increasing it as needed. Plant nutrients are available in grow and bloom versions for use during the vegetative and flowering stage.

Cannabis Plant Growth Stages

Growing weed indoors successfully requires understanding the plant’s different growth stages.

Here is what to expect during its life cycle.


seeds germinating, growing weed indoors for beginners

If starting from seeds, germination can be accomplished using the paper towel method. Cannabis seeds can be placed between two plates and moist paper towels. Seeds begin to sprout within a few days in this environment.

Vegetative Stage

During the vegetative stage, cannabis plants focus their growth on their leaves and branches and need at least 18 hours of light and 6 hours of darkness. A timer can help you keep track of light cycles. Temperatures should be between 70 and 85º F. Plants should be watered when the top inch or two of the soil feels dry.

Flowering Stage

During the flowering stage, plants will develop flower buds and require 12 hours of light and 12 hours of darkness. Regularly prune the plant to ensure every bud site gets enough light to grow. During the final week or two, growers may flush the nutrients from their plants by only feeding them water.


The perfect time to harvest your plants is when about 50 percent of the trichomes have turned an amber color. When it’s time to harvest, remove the branches from the main stem using sharp shears and prune the fan leaves. 


Drying the cannabis bud branches usually occurs in a dark and cool area with temperatures between 60 and 70º F and relative humidity (RH) of 50%. Branches can be hung from a wire or string to dry. When the branch breaks off with an audible snap, the buds have dried properly.

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Once your buds have dried, it’s time to place them in an airtight glass jar and cure cannabis buds for a few weeks or months. Open the jar’s lid every day for about 10 minutes to release stale air and introduce fresh air into the jar. Curing times depend on your individual preference.

Learn How to Grow Marijuana Plants at CTU

Growing marijuana indoors for the first time takes time, patience, and practice. Enrolling in Cannabis Training University’s online expert training can give you the skills and knowledge you need to start your own cannabis garden at home.

Learn everything about growing indoors, from germinating cannabis seeds to harvesting marijuana plants at the right time. Our curriculum provides you with HD videos, ebooks, quizzes, and more to help you grow your own weed from home.

Enroll Now