How much cannabis does one plant yield?
A healthy cannabis plant grown outdoors in the ground yields about 1 to 2 pounds (450 to 900 g) of dried flower. Indoor plants in a 5-gallon pot under a 600W light yield about 2 to 4 ounces (56 to 112 g). Those are common ranges, not promises; light, genetics, pot size, and grow style move the number more than plant count alone.
average cannabis yield per plant
Yield per plant is a poor single number to chase. Two growers with the same clone can finish 3 ounces apart because one filled the canopy and the other did not. Read the ranges below as starting points, then measure your own results.
Yield ranges by grow style
- Outdoor, in the ground: 1 to 2 lb (450 to 900 g) per plant; large plants in long seasons can pass 3 lb.
- Outdoor, 20-gallon pot: 8 to 16 oz (225 to 450 g).
- Greenhouse: 1 to 3 lb per plant, depending on light and pot size.
- Indoor, 5-gallon pot, 600W HID or LED: 2 to 4 oz (56 to 112 g).
- Indoor sea of green (SOG), small plants: 0.5 to 1 oz each, with many plants per square foot.
- Autoflower, indoor: 1 to 3 oz (28 to 85 g); some large autoflower lines reach 4 oz.
These numbers refer to dried, trimmed flower. Wet weight runs about four times heavier, so a plant that looks like 12 oz wet is closer to 3 oz dry.
How Much Cannabis Does One Plant Yield: A Comprehensive Guide
What factors drive yield per plant?
Yield is the product of light captured, area covered, and how well the plant turns both into flower. Genetics set the ceiling; everything else decides how close you get to it.
Average Cannabis Yield per Plant: Realistic Numbers for Indoor, Outdoor, and CBD Hemp
Genetics
Some cultivars carry large colas and stretch hard; others stay compact with small, dense tops. Seed sellers list indoor and outdoor yield estimates for each strain. Treat those numbers as marketing ranges and expect the low end on a first run.
Light
Light is the biggest lever indoors. A plant under 200W of weak LED will not match the same clone under 600W of quality light. Outdoors, hours of direct sun and the angle of the sun across the season decide most of the result.
Container size and root space
A 3-gallon pot caps plant size no matter how good the light is. Most indoor growers get better results with 5 to 10 gallons, and outdoor plants in the ground root far wider than any pot allows.
Training and canopy shape
Topping, low-stress training, and SCROG turn a tall plant into a flat canopy that catches light on every top. A trained plant with 12 even colas often beats an untrained plant with one main cola.
Water, nutrients, and root health
Overfeeding burns tips and stalls growth; underfeeding leaves plants pale and thin. Steady moisture and a clean root zone matter more than any single additive. Measure runoff and keep pH in range for your medium.
Climate and airflow
Heat stress, low humidity, and poor airflow all cut final weight. Keep daytime temps in the mid 70s to low 80s F and humidity in the 40 to 60% range in flower. Bud rot in a humid room can erase a good harvest in a week.
Harvest timing
Chopping early costs weight and potency. Wait until trichomes are cloudy with some amber and buds have swollen past the white pistil stage. A week too soon can cut into dry weight and smell.
How do I estimate yield before harvest?
For indoor grows, use grams per watt. Divide dry flower weight by the watts of light used. New growers land near 0.5 g/W; skilled growers with good canopy control reach 1 g/W or more.
For a rough pre-harvest guess, weigh wet buds from one branch, count branches of similar size, and multiply by 0.25. The result is a ballpark, not a promise, and dense indica-style buds shrink less than airy sativa tops.
What is a good grams-per-watt result?
0.5 to 1 g/W is a solid range for home grows. Above 1 g/W points to strong genetics, good canopy management, and a dialed room. Results well under 0.5 g/W often signal weak light or a short veg.
Does plant size predict yield?
Not on its own. A 6-foot plant with sparse branches can lose to a 3-foot plant with a wide, even canopy. Canopy area, light received, and bud density predict dry weight better than height.
How can I raise yield per plant without more space?
- Fill the canopy before flip. Veg longer and train until the light footprint is covered.
- Give each plant enough root space. Move up to 7 or 10-gallon pots if height allows.
- Upgrade the light before adding plants. More watts per square foot beats more plants per tent.
- Keep the climate stable. Big swings in temp or humidity cost weight every week.
- Prune weak lower growth early. Remove larf so energy goes to top colas.
- Harvest at peak ripeness. Check trichomes with a loupe instead of guessing from pistils.
- Log every run. Dry weight, pot size, light watts, and veg days teach you more than forum estimates.
Indoor vs outdoor yield: what changes?
Outdoor plants can yield several times more than indoor plants because they get free sun and unlimited root space. Indoor growers trade raw weight for control: steady climate, fewer pests, and predictable harvest dates.
- Outdoor pros: free light, huge plants, low cost per gram.
- Outdoor risks: weather, mold, pests, and a single harvest window.
- Indoor pros: control, year-round harvests, consistent quality.
- Indoor risks: electricity cost, heat, and a hard ceiling on plant size.
Do autoflowers yield less?
Autoflowers often yield less per plant than photoperiod plants, mainly because they flower on a fixed clock and veg for a short window. A well-grown auto in a 5-gallon pot can still hit 3 to 4 oz indoors. Autoflower yields improve with a strong start: warm roots, good light from day one, and no transplant shock.
What mistakes cut yield the most?
- Vegging too short, so the canopy never fills.
- Running too many plants under too little light.
- Letting pots dry out hard during flower.
- Feeding heavy in late flower and causing salt buildup.
- Harvesting on a calendar date instead of trichome color.
- Drying too fast, which shrinks final weight and hurts smell.
What does yield per plant mean for CBD hemp?
Hemp grown for CBD flower follows the same rules: light, spacing, and genetics set flower mass. Field growers measure yield per acre, while home growers measure grams per plant. Whatever the scale, test cannabinoid levels before sale or use, and keep THC within the legal limit for your state.
What to remember about yield per plant
Expect 2 to 4 oz per plant indoors and 1 to 2 lb outdoors, then work on light, canopy, and timing to push toward the top of that range. Track dry weight every run and let your own numbers replace internet averages. Yield follows repeatable habits more than any single product.