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 selecting the right weed strains to produce. The three main types of pot plants each have their own traits.
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 flowering time between 10-12 weeks indoors. Top energizing varieties include Jack Herer, Durban Poison, Super Lemon Haze, and Jack Herer.
Indicas
These strains provide relaxing body-focused effects and grow short and bushy with broad leaves. Accustomed to colder mountain climates, they flower faster within 8-9 weeks. Popular relaxing 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 times around 2.25-2.5 months. Popular hybrids are OG Kush, Girl Scout Cookies, 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 spot.
Location
Choose an unused space with quick access to water and power outlets. An empty spare room, large closet, corner of the basement, or cultivation tent tucked away in a garage all make great discreet grow room spots.
Lights
Cannabis requires powerful light for all growth stages. LEDs are energy-efficient and come in broad spectrum options mimicking natural outdoor light. Cover 250-400 watts per sq. ft for the vegetative stage and 400-600 watts per square foot for flowering.
Airflow
Proper airflow and exhaust systems maintain ideal temp, humidity, and pure CO2 levels. Set up quiet 10-15 cm fans or scrubbers to circulate stale air and reduce smells.
Layout
Maximize your space by positioning plants carefully under the lights and allowing room to reach and work around them. Set up separate zones for growth, bloom, drying, and cloning.
Growing Mediums
Marijuana can be cultivated in various mediums, each with pros and cons. Pick a appropriate option for your particular setup and growing style.
Soil
The classic medium, soil is cheap and simple for new growers. 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 coconut fiber holds water but still lets in air to the roots. It's more sterile and more consistent than soil. Use coir-specific fertilizers to prevent calcium buildup.
Hydroponics
In hydro systems, plant roots grow directly in nutrient water solution. This allows rapid development but needs careful observation of solution properties. DWC and irrigation systems are popular techniques.
Germinating Seeds
Germination activates your weed seeds to begin growing radicles. This readies them for transplanting into their cultivation medium.
Towel Method
Put seeds between wet paper towel and maintain them damp. Inspect after 2-7 days for emerging taproots indicating germination is complete.
Direct Planting
Plant seeds directly into wetted cultivation medium 6mm deep. Gently water and wait 7-14 days until seedlings break through the surface.
Rockwool Cubes
Soak rockwool cubes in balanced water. Insert seeds 1⁄4 inch deep into the cubes. Keep cubes moist until sprouts appear within a week to 2 weeks.
Repotting Seedlings
Once sprouted, cannabis seedlings need to be repotted to prevent crowding. Move them into proper sized containers.
Preparing Containers
Fill large containers with cultivation medium amended with time-released nutrients. Allow containers to absorb water for 8-12 hours before repotting.
Gently repotting
Carefully separate seedling roots from sprouting medium using a spade. Put into prepared container at equal depth as before and gently water in.
Growth Stage
The vegetative stage promotes foliage and plant form through 18-24 hours of daily lighting intensity. This stage usually lasts 1-2 months.
Providing 18-24 Hours of Lighting
Use lamps on a 24 hour cycle or natural sunlight to initiate nonstop photosynthesis. Light output influences height and internodal spacing.
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 14 days and increase slowly.
LST and topping
Topping, low stress training, and trellising manipulate shoot patterns for flat foliage. This increases 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 outdoor 12/12 timing. This signals plants to begin flowering.
Flushing
Flushing flushes out nutrient salts to enhance flavor. Feed weakly the first period then just use plain water the last 2 weeks.
Flushing
Continue 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 ensures maximum 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 mature evenly.
Harvesting plants
Use sterilized, razor-sharp trimming scissors to carefully slice each plant at the base. Leave several inches of stalk attached.
Curing
Hang intact plants or colas upside down 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 process smooths bitterness and intensifies cannabinoid contents.
Curing containers
Trim dried buds from branches and store into glass jars, packing about 3⁄4 full. Use a hygrometer to monitor container humidity.
Burping Daily
Unseal containers for a few hours daily to grow light guide gradually reduce moisture. Remoisten buds if humidity goes under 55%.
Long term storage
After 2-3 weeks when humidity levels off around 55-60%, do a final trim and keep forever in airtight jars.
Common Problems and Solutions
Even experienced cultivators run into different pot plant problems. Identify issues early and fix them properly to maintain a strong garden.
Poor feeding
Chlorosis often signify insufficient nitrogen. Purpling stems and leaves show low phosphorus. Test pH and boost nutrients gradually.
Pests
Spider mites, fungus gnats, mites, and nematodes are frequent cannabis pests. Use neem oil sprays, ladybugs, and sticky traps for natural control.
Powdery mildew
Excessive moisture promotes botrytis and bud rot. Improve airflow and circulation while lowering RH below 50% during bloom.
Summary
With this complete indoor cannabis cultivation guide, you now have the knowledge to cultivate bountiful strong buds for private grows. Follow these steps and techniques throughout the seed starting, vegetative, and bloom stages. Spend in good equipment and carefully monitor your plants. In time, you'll be rewarded with frosty fragrant buds you raised yourself under the patient guidance of your green hands. Good luck cultivating!