Whether you're just starting out with marijuana growing or looking to improve your existing crop, following this complete guide will help you produce big, high-quality yields right at home. With the right equipment, techniques, and attention, cultivating marijuana indoors can be an extremely satisfying and cost-effective endeavor.
Choosing Weed Strains
The first step in planning your indoor harvest is choosing the right marijuana varieties to cultivate. The three main types of cannabis plants each have their own qualities.
Sativas
Known for their energizing mental effects, these strains grow tall and slender with narrow leaves. They thrive in tropical tropical climates and have a longer blooming time between 10-12 weeks indoors. Top sativa strains include Sour Diesel, Durban Poison, and Jack Herer.
Relaxing strains
These strains provide relaxing body-focused effects and spread short and bushy with wide leaves. Adapted to cooler mountain climates, they bloom faster within 2-2.25 months. Popular indica strains include Granddaddy Purple, Northern Lights, and Bubba Kush.
Mixed strains
Mixed strains blend traits from both energizing strains and indicas. They offer combined effects and have medium flowering periods around 2.25-2.5 months. Well-known hybrids are Blue Dream, OG Kush, and Blue Dream.
Setting Up Your Cultivation Space
Cannabis plants need the right controlled environment to thrive. Key factors for indoor grows are lights, ventilation, layout, and finding the ideal discreet area.
Location
Choose an empty space with easy access to irrigation and electrical outlets. An empty extra bedroom, unused closet, basement corner, or cultivation tent locked away in a garage all make great hidden grow room spots.
Lighting
Pot requires strong light for all vegetative stages. LED grow lights are efficient and come in full spectrum options replicating natural outdoor light. Provide 15-25 watts per sq. ft for the vegetative stage and 20-40 watts per sq. ft. for flowering.
Airflow
Proper airflow and exhaust systems maintain ideal temp, humidity, and pure CO2 levels. Install silent 10-15 cm fans or scrubbers to circulate stale air and reduce smells.
Layout
Maximize your space by positioning plants strategically under the lamps and allowing room to access and work around them. Set up distinct zones for growth, flowering, drying, and propagation.
Growing Substrates
Marijuana can be cultivated in various mediums, each with pros and cons. Pick a suitable option for your specific setup and cultivation style.
Soil
The traditional substrate, soil is inexpensive and easy for beginners. It provides great flavor but requires more irrigation and nutrients to feed plants. Enrich soil with vermiculite or coir to enhance drainage.
Coco Coir
Made from coconut husks, reusable coco coir retains water but still lets in air to the roots. It's more sterile and more consistent than soil. Use coco-specific fertilizers to prevent accumulation.
Water systems
In hydro systems, plant roots grow directly in nutrient irrigation solution. This enables quick development but needs careful observation of solution properties. DWC and irrigation systems are popular methods.
Sprouting Seeds
Sprouting prepares your pot seeds to start growing radicles. This readies them for transplanting into their cultivation medium.
Paper Towel Method
Place seeds between moist paper towels and keep them moist. Check after a week for growing radicles showing sprouting is complete.
Planting directly
Insert seeds directly into pre-moistened growing medium 1⁄4 inch deep. Gently water and wait 1-2 weeks until sprouts break through the top.
Cubic rockwool
Soak cubic rockwool starters in balanced water. Insert seeds 1⁄4 inch deep into the cubes. Keep cubes moist until sprouts appear within a week to 2 weeks.
Transplanting Seedlings
Once sprouted, cannabis seedlings need to be repotted to prevent crowding. Move them into appropriately sized containers.
Preparing Containers
Load large containers with growing medium amended with slow-release fertilizer. Let pots to absorb water overnight before repotting.
Gently repotting
Carefully separate seedling roots from germination medium using a spoon. Put into pre-soaked pot at same depth as before and lightly water in.
Growth Stage
The growth stage encourages leafy growth and plant structure through 3/4 to full day of continual lighting exposure. This stage usually lasts 1-2 months.
Providing 18-24 Hours of Lighting
Use lamps on a 24 hour cycle or outdoor light to initiate constant photosynthesis. Lamp output influences height and node distance.
Fertilizing
Use grow stage fertilizers higher in nitrogen. Make sure pH remains around 6.5 for proper fertilizer uptake. Feed 1⁄4 to 1⁄2 concentration after 2 weeks and increase slowly.
LST and topping
Topping, low stress training, and trellising manipulate growth shapes for even canopies. This boosts yields.
Bloom Stage
The flowering stage grows buds as plants show their sex under a 12 hour light timing. It lasts 8-12 weeks based on strain.
Switching to 12/12
Switch lamps to 12 hours on, 12 hours off or place outdoors for natural 12 hour cycle. This signals plants to begin flowering.
Flushing
Flushing flushes out nutrient salts to enhance taste. Feed lightly the first weeks then just use pH'd water the final 2 weeks.
Flushing
Maintain 12 hour photoperiod but leach using pH-balanced water only. Return to plain watering if buds aren't yet ripe after two weeks.
Harvesting
Recognizing when cannabis is completely mature delivers maximum potency and aroma. Harvest plants at optimal ripeness.
Identifying Ripeness
Check swollen calyxes, faded pistils, and 10-15% cloudy trichs. Check buds across the plant as they won't all ripen evenly.
Cutting Plants
Use sterilized, razor-sharp pruning shears to gently slice each plant at the base. Leave several inches of stalk attached.
Drying
Suspend whole plants or branches inverted in a lightless room with average temp and RH around 50-60% for 7-14 days.
Aging
Curing continues desiccating while improving the buds like aged spirits. This process smooths bitterness and further develops cannabinoid contents.
Curing containers
Trim dried buds from branches and store into glass jars, packing about 75% capacity. Use a hygrometer to measure container moisture.
Burping Daily
Open containers for a few hours daily to gradually reduce moisture. Remoisten buds if humidity goes under 55%.
Long term storage
After 2-3 weeks when humidity stabilizes around 55-60%, do a final indoor cannabis grow guide trim and store forever in airtight jars.
Troubleshooting
Even experienced growers run into different marijuana plant problems. Detect issues early and address them correctly to keep a vibrant garden.
Nutrient Deficiencies
Yellowing leaves often indicate inadequate nitrogen. Anthocyanins and leaves show phosphorus deficiency. Check pH and boost fertilizers slowly.
Bugs
Spider mites, fungus gnats, thrips, and root aphids are common marijuana pests. Use organic sprays, predator bugs, and yellow traps for natural control.
Mold
High humidity encourages powdery mildew and root rot. Increase circulation and venting while reducing RH under 50% during flowering.
Conclusion
With this complete indoor cannabis cultivation guide, you now have the info to cultivate bountiful strong buds for personal harvests. Follow these steps and techniques throughout the seed starting, growth, and bloom stages. Spend in good equipment and carefully monitor your plants. In time, you'll be compensated with sticky fragrant buds you grew yourself under the loving care of your green thumbs. Good luck cultivating!