Learning the best way to grow cannabis indoors may intimidate new cultivators, but there’s no reason for that!
This option lets you cultivate no matter the season, choose strains that don’t thrive in your climate, and optimize conditions for quality output. It takes more work to get started, but the barrier to entry isn’t unsurmountable.
This guide breaks indoor marijuana gardening into five simple steps, turning one large task into bite-sized chunks to master one at a time.
First up, pick a strain and order high-yield seeds (check here). Once they arrive, here’s what you need to do to turn them into smokable buds.
Step 1 – Organizing Your Setup
The best way to grow weed in your house is by constructing a grow room that mimics optimal outdoor conditions for your particular strain.
Preparing the setup is the costliest and most complicated part of indoor cultivation. Luckily, it’s also a one-time investment that allows countless future growing projects.
Here’s your shopping list:
- Lights and a timer— marijuana plants need consistent light from LED, fluorescent, or HPS lamps.
- Growing substrate—either soil and pots or any of the many available solutions (Rockwool, perlite, coco coir) for soilless systems.
- Heating sources and a thermometer—your home heating system will do, but monitor the space to prevent cold spells.
- (De)humidifiers and a hygrometer—marijuana is sensitive to humidity, and these gadgets maintain optimal moisture levels.
- Ventilators and exhaust fans—fresh moving air promotes healthy photosynthesis.
- Nutrients—photosynthesis can’t sustain a large harvest alone; get high-quality nutrient solutions to add to waterings.
Learn to control your setup, and you already have the best way to plant weed seeds indoors.
Step 2 – Germination & Seedlings
Germination is the best way to start weed seeds indoors. This process uses warmth and water to prepare them for robust growth.
There are several ways to sprout seeds, from paper towels to Rockwool starter cubes. In any case, they need a moist, safe environment at 70–80° F.
Germination takes several days and ends when a tiny white taproot breaks through the seed surface. You then sow them in shallow soil or cubes for hydro. The first set of cotyledons soon make way for the true leaves, and you have seedlings.
As a rule of thumb, here’s how to take care of a seedling:
- Mist with a spray bottle instead of watering directly to avoid drowning the roots.
- Keep it under gentle lights, using an 18/6 schedule of light and darkness.
- Maintain the temperature at 80° F (70° F for the period of darkness).
- Keep the relative humidity at 70%, as moisture strengthens the roots.
Step 3 – The Vegetative Stage
Seeing those familiar seven-tip leaves denotes the beginning of the vegetative stage. Your plant’s about to develop the stem, branches, and foliage.
Now’s the time to look into your strain’s specific requirements. Temperature, humidity, nutrients, training techniques, and potential pitfalls vary between indica and sativa cultivars.
In general, here’s what makes vegging cannabis plants thrive:
- An 18/6 light schedule and powerful grow lamps
- Temperatures at 70–80 F° and humidity of 40–50%
- Nitrogen-heavy feedings at least once a week
- Light watering around the roots every other day
- Weekly trimming and light branch manipulation
The rest depends on your skill level, strain, and preferences. Many people opt for high-stress or low-stress training to promote output; some also play with CO2 supplementation, red-blue light spectrums, and other advanced techniques.
Since you’re growing indoors, you determine the length of the vegetative stage. Once your plant has reached a desirable size, flip the lights for flowering.
Step 4 – The Flowering Stage
Flipping the lights means switching to a 12/12 light schedule. This change makes crops think the fall is approaching, and they respond by producing buds.
The first week of blooming incurs a growth spur. Then flowers start forming, emerging at the nodes between branches and the main stem. Wispy pistils turn into real buds over the following weeks.
If you’re not using feminized seeds, check plant sex and remove all males early into flowering. Otherwise, they might pollinate the females and ruin your smokable weed.
The optimal conditions are strain-dependent, but here’s what blossoming plants generally enjoy:
- Twelve hours of uninterrupted darkness
- Temperatures at 65–75° F
- Relative humidity below 40%
- Watering once every three days
- Regular potassium and phosphorus feed
- Constant ventilation to ward off mold or rot
Check your strain’s expected flowering time and combine that information with what you see on the buds. Signs of ripeness include a strong smell, sticky resin, and curled pistil hairs—they indicate that it’s harvest time.
Step 5 – Harvests & Drying
Harvesting means collecting the buds from the branches, which you can do in two ways:
- Cutting down the entire plant and hanging it upside-down to dry
- Trimming individual flowers and laying them on a mesh rack
Either way, handle with care to avoid disturbing or damaging the trichomes.
Drying takes a week or two and works best at 65° F with 45% relative humidity. Then it’s onto curing, which lasts around six weeks. Storing buds in well-sealed jars locks the cannabinoids and terpenes in place, producing smoother smoke.
In the end, you can fit your grow room to your budget, skills, and goals. This guide outlines the basic principles of controlled cultivation, setting you up for further research.
Always use information about your strain as your primary reference. Adjust the setup to its needs for the highest-quality output.
Now that you know the best way to grow cannabis indoors, why not buy seeds and put your knowledge to practice? It’s much easier than it first seems, and the results are worth the effort.
Jennifer Gallagher, an experienced cannabis grower at SeedSupreme Seedbank. During a 7-year career in the marijuana growing business, Jennifer has gained a high competence in this field. As far as weed is concerned, she knows it all inside out. Jennifer is an expert in pot-growing, as well as cannabis types and their effects. She’s also familiar with all legislation nuances.