Quick Answer
Growing cannabis at home comes down to five controls: genetics, light, medium, water and nutrients, and airflow. Start with seed from a licensed source, keep the light cycle steady, plant in a well-drained mix, water when the top inch goes dry, and feed at half strength. Photoperiod plants finish in 10 to 16 weeks from seed. Autoflowering plants finish in 8 to 11 weeks.
What You Need Before You Start
- A legal grow: check state and county rules on plant count, plant height, and fence or lock requirements.
- Seed from a licensed breeder or state-legal retailer.
- A closet, tent, or room with a door and a way to manage odor.
- A light: LED, HID, or natural sun in a secure spot.
- Well-drained potting mix or coco coir blend.
- Base nutrients, a pH meter, a timer, a small fan, and curing jars with a hygrometer.
Step-by-Step Instructions
- Check your state cultivation limit and write down the plant count you may legally keep.
- Germinate each seed between two damp paper towels, keep them near 75F, and wait 2 to 5 days for a taproot.
- Plant the sprouted seed 0.5 inch deep in a small pot of moist mix, taproot pointing down.
- Set the light schedule. Keep seedlings on 18 hours of light and 6 hours of dark for photoperiod plants.
- Hold the room between 68 and 78F and humidity between 60 and 70 percent during early growth.
- Water when the top inch of medium feels dry, and pour until a little runoff leaves the pot.
- Feed at half the label strength starting week two, and raise the dose only if leaves stay dark green.
- Move air across the canopy with a small fan to strengthen stems and lower mold risk.
- Train the plant in veg by bending the top stem sideways and tying it down to open the canopy.
- Inspect leaf undersides every few days for mites, aphids, and caterpillar damage.
- Switch photoperiod plants to a 12-hour light and 12-hour dark cycle when the plant reaches half the height you want.
- Watch the trichomes on the buds under a jeweler's loupe as flowering nears week eight.
- Harvest when most trichomes turn cloudy, with a few amber heads for a heavier effect.
- Cut branches, hang them in the dark at 60 to 70F and 55 to 65 percent humidity, and dry for 7 to 14 days.
- Cure the dry buds in sealed jars, opening the lids once a day for the first week, then every few days for three weeks.
Vegetative Stage
Once the seedling has four to five sets of leaves, the plant enters vegetative growth and pushes new nodes fast. Keep the light schedule fixed, raise the light as the plant grows, and top the canopy with low-stress bending. A healthy plant adds 1 to 2 inches per day under strong light. Root health drives everything here, so let the medium dry between waterings rather than keeping it wet.
Flowering Stage
For photoperiod plants, 12 hours of dark triggers flowering. Stretch happens in the first two weeks, then the plant sets bud sites and swells through weeks five to eight. Feed a bloom formula with more phosphorus and potassium, keep humidity under 55 percent, and hold nighttime temperatures above 60F. Autoflowers skip the light change and flower on their own timeline, usually three to four weeks from sprout.
Harvest and Cure
Trichome color is the most reliable harvest signal. Clear heads mean early, cloudy heads mean peak THC, and amber heads mean more body effect from THC degradation. Dry the branches in the dark, then trim and cure in jars. A slow cure protects terpenes and lowers harshness. Sample after two weeks and let the rest sit for a full month.
Stage Timeline
- Seedling: 1 to 2 weeks.
- Vegetative: 3 to 8 weeks, depending on plant size and training.
- Flowering: 8 to 11 weeks for photoperiod plants.
- Drying and curing: 3 to 5 weeks.
Common Problems to Fix Early
- Yellow lower leaves: feed a little more or check pH.
- Crisp leaf tips: back off the nutrient dose and flush the pot.
- Stretched seedlings: raise the light intensity or lower the fixture.
- Powdery mildew: improve airflow and keep humidity below 55 percent.
- Small buds: increase light intensity and reduce heat stress.