What you need to grow cannabis
You need six core items to grow cannabis: a legal grow space, a cannabis seed or clone, a light source, a growing medium in a container with drainage, water with nutrients, and ventilation with basic measuring tools. A timer, pH meter, thermometer, and hygrometer turn those items into a repeatable setup. Confirm home cultivation rules in your state and city before you buy anything.
Buy Cannabis Seeds for Beginners Guide: Advice, Parameters, and Pitfalls
Supplies at a glance
- Viable cannabis seed or rooted clone
- Grow light sized to your space
- Potting mix or coco coir
- Container with drainage holes
- Water and cannabis nutrients
- Exhaust fan and circulation fan
- Light timer
- pH meter and thermometer
- Hygrometer
- Pruning shears and plant ties
- Drying space with airflow
Prerequisites
Home cannabis cultivation is legal in some US states and prohibited in others. Check your state cannabis program and local ordinances for plant limits, enclosure requirements, and whether you may grow outdoors. Renters need landlord approval. Keep your plant count within the legal limit and secure the space from children and pets.
Setup steps
- Confirm your legal plant limit with your state cannabis program.
- Choose an indoor space with power, water access, and an exhaust route.
- Set out a container with drainage holes.
- Fill the container with a cannabis-suitable potting mix or coco coir.
- Install an exhaust fan and a small circulation fan.
- Hang the light at the height recommended by the manufacturer.
- Set the light timer for the correct photoperiod.
- Mix nutrients into water at the label rate.
- Adjust the nutrient solution to the target pH range.
- Water the medium until runoff appears.
- Record temperature, humidity, and pH in a log.
Light
Photoperiod cannabis plants need about 18 hours of light and 6 hours of dark during vegetative growth, then 12 hours of light and 12 hours of dark to flower. Autoflowering plants can run under 18 to 20 hours of light from seed to harvest. Match light wattage to the square footage of the grow space and keep the fixture at the distance the maker specifies. Too little light produces weak stems. Too much light bleaches leaves and raises heat.
Growing medium and containers
Use a medium that drains well and holds some moisture. Soil mixes buffer pH better for beginners. Coco coir drains fast and needs more frequent feeding. Every container needs drainage holes. Fabric pots air-prune roots and dry faster than plastic pots. Match pot size to plant size; a 5-gallon pot suits many indoor photoperiod plants, while autoflowers often finish in 3-gallon pots.
Water, nutrients, and environment
Water when the top inch of the medium feels dry. Feed at the label rate and check pH after mixing. Keep the room between 65 F and 80 F with 40 to 60 percent relative humidity during vegetative growth, then lower humidity during flower. Run the exhaust fan to remove heat and moisture. A hygrometer and thermometer show whether the room needs adjustment before plant problems appear.
Common mistakes
- Watering on a fixed schedule instead of checking the medium
- Skipping drainage holes
- Changing the light timer without a reason
- Running a closed room without air exchange
- Feeding above the label rate
- Ignoring legal plant limits