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, growing weed indoors can be an extremely rewarding and cost-effective endeavor.
Choosing Pot Varieties
The first step in planning your indoor crop is picking the right cannabis cultivars to grow. The three main types of weed plants each have their own characteristics.
Energizing strains
Known for their invigorating intellectual effects, sativas spread tall and slender with narrow leaves. They flourish in hotter equatorial climates and have a longer blooming time between 2.5-3 months indoors. Top sativa varieties include Sour Diesel, Durban Poison, and Jack Herer.
Relaxing strains
These strains provide relaxing full-body effects and grow short and bushy with wide leaves. Accustomed to cooler mountain climates, they flower faster within 2-2.25 months. Popular relaxing strains include Northern Lights, Bubba Kush, and Bubba Kush.
Mixed strains
Hybrid strains mix traits from both sativas and relaxing strains. They offer blended effects and have moderate blooming times around 9-10 weeks. Well-known mixes 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 grow tent tucked away in a garage all make great stealthy cultivation room spots.
Lights
Weed requires powerful light for all growth stages. LEDs are energy-efficient and come in broad spectrum options mimicking real sunlight. Provide 15-25 watts per square foot for the growth stage and 20-40 watts per sq. ft. for bloom.
Ventilation
Proper ventilation and exhaust systems maintain ideal temp, humidity, and pure CO2 levels. Set up quiet 10-15 cm fans or carbon filters to circulate stale air and eliminate smells.
Layout
Maximize your space by arranging plants carefully under the lights and leaving room to reach and work around them. Set up distinct zones for vegetation, bloom, drying, and cloning.
Cultivation Mediums
Weed can be grown in various substrates, each with benefits and cons. Pick a suitable option for your specific setup and growing style.
Soil
The classic medium, soil is cheap and easy for beginners. It provides great flavor but requires more irrigation and nutrients to feed plants. Enrich soil with vermiculite or coco to improve drainage.
Coconut coir
Made from coir, renewable coco coir retains water but still allows air to the roots. It's cleaner and more predictable than soil. Use coco-specific nutrients to avoid calcium buildup.
Hydroponics
In hydro systems, plant roots grow directly in nutrient water solution. This allows rapid growth but needs close observation of water chemistry. Deep water culture and irrigation systems are common techniques.
Germinating Seeds
Germination prepares your cannabis seeds to begin sprouting taproots. This prepares them for planting into their growing medium.
Paper Towel Method
Place seeds between moist paper towel and maintain them damp. Inspect after a week for growing radicles showing sprouting is complete.
Planting directly
Insert seeds directly into pre-moistened cultivation medium 6mm deep. Gently water and wait 7-14 days Learn More until seedlings break through the top.
Cubic rockwool
Soak cubic rockwool starters in pH-adjusted water. Insert seeds 1⁄4 inch deep into the cubes. Keep cubes moist until seedlings emerge within 1-14 days.
Transplanting Young plants
Once germinated, marijuana young plants need to be repotted to avoid overcrowding. Move them into appropriately sized containers.
Preparing Containers
Fill large containers with cultivation medium amended with slow-release fertilizer. Let pots to soak up water overnight before transplanting.
Carefully Transplanting
Gently loosen young roots from sprouting medium using a spoon. Place into pre-soaked pot at equal depth as before and lightly water in.
Vegetative Stage
The vegetative stage encourages foliage and plant form through 3/4 to full day of continual light exposure. This stage usually lasts 1-2 months.
Using 3/4 to full day of Light
Use grow lights on a 24 daily schedule or outdoor light to trigger constant growth. Lamp output influences size and internodal spacing.
Nutrients
Use grow stage nutrients higher in N. Make sure pH remains around 6.5 for proper fertilizer uptake. Feed 25-50% strength after 2 weeks and increase slowly.
LST and topping
Fimming, LST, and scrogging manipulate growth shapes for flat foliage. This increases yields.
Bloom Stage
The flowering stage develops buds as plants reveal their sex under a 12/12 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 outdoor 12/12 timing. This triggers plants to start blooming.
Stop Fertilizing
Flushing flushes out nutrient salts to improve flavor. Fertilize lightly the first weeks then just use plain water the last 2 weeks.
Flushing
Continue 12/12 light timing but flush using pH-balanced water only. Return to plain watering if buds aren't ripe after two weeks.
Harvesting
Recognizing when cannabis is completely mature ensures peak potency and aroma. Harvest plants at optimal maturity.
Signs of readiness
Check swollen calyxes, faded pistils, and 5-15% amber trichomes. Check buds around the plant as they don't all ripen evenly.
Harvesting plants
Use clean, sharp trimming scissors to gently cut each plant at the base. Keep 5-10cm of stem attached.
Drying
Suspend whole plants or branches inverted in a lightless room with moderate temperature and humidity around 45-65% for 7-14 days.
Curing
Aging keeps drying while aging the buds like aged spirits. This technique smooths bitterness and intensifies cannabinoid and terpene profiles.
Curing containers
Manicure dried buds from stems and store into sealed containers, filling about 3⁄4 full. Use a sensor to monitor jar humidity.
Opening jars daily
Unseal jars for a few hours each day to gradually lower moisture. Rehydrate buds if RH drops below 55%.
Final Cure
After 2-3 weeks when moisture levels off around 55-65%, perform a last manicure and keep long-term in sealed jars.
Troubleshooting
Even seasoned growers run into various marijuana plant problems. Detect problems soon and address them properly to maintain a strong garden.
Poor feeding
Chlorosis often indicate insufficient nitrogen. Purpling stems and leaves show low phosphorus. Test pH and boost fertilizers slowly.
Bugs
Thrips, aphids, fungus gnats, thrips, and root aphids are common weed pests. Use organic sprays, predator bugs, and yellow traps for organic control.
Powdery mildew
Excessive humidity encourages powdery mildew and bud rot. Improve airflow and circulation while lowering RH under 50% during bloom.
Conclusion
With this complete indoor weed cultivation guide, you now have the knowledge to cultivate bountiful strong buds for private grows. Follow these steps and techniques throughout the seed starting, growth, and flowering stages. Invest in good gear and closely monitor your plants. In time, you'll be rewarded with frosty fragrant buds you raised yourself under the loving care of your green thumbs. Happy growing