Autoflower Yield Per Plant: What to Expect and How to Get More
What autoflowers realistically yield per plant indoors and outdoors, why breeder g/m² claims need translating, and the five factors that actually move your harvest weight.
By Autoflower.net Editorial Team
A realistic indoor autoflower yield is about 1 to 5 ounces (28 to 140 g) of dried flower per plant under a decent light, based on what growers consistently report. Under stronger lights and good practice, some growers double that; outdoors, healthy autos commonly produce anywhere from a few ounces to 100 g or more per plant, with breeder claims reaching 300 g. Here is how to set expectations and what actually moves the number.
What growers actually report
Community reports are the best real-world benchmark, because breeder figures describe ideal outcomes:
- In a THCFarmer discussion of average autoflower yields, one grower summarised roughly 25 g (just under an ounce) per plant as average, 40 g as impressive, with well-run setups reporting 60 to 80 g.
- Across r/Autoflowers and r/microgrowery threads, typical indoor harvests cluster between 1 and 5 oz per plant, with small-tent growers reporting 90 to 120 g and occasionally more.
- Breeder Sweet Seeds markets some autos at up to 650 g/m² indoors and up to 300 g per plant outdoors - a clear breeder claim, not an independent measurement.
The spread is enormous because yield is a light-driven outcome. The same seed under 100 W of panel light and under 300 W with good airflow is two different harvests.
Breeder yield claims from our database
For comparison, these indoor yield figures are exactly what the breeders publish for strains in our database:
| Strain | Breeder | Claimed indoor yield | Claimed seed-to-harvest | |---|---|---|---| | Auto Ultimate | Dutch Passion | 500-600 g/m² | 11 weeks | | Gorilla Glue Auto | Fast Buds | 450-600 g/m² | 9 weeks | | Amnesia Haze Auto | Royal Queen Seeds | 400-500 g/m² | 11 weeks | | Pineapple Express Auto | Barney's Farm | 400-500 g/m² | 10 weeks | | Auto Night Queen | Dutch Passion | 400-500 g/m² | 11 weeks | | Auto White Widow | Dutch Passion | 350-450 g/m² | 10 weeks | | Northern Lights Auto | Royal Queen Seeds | 350-450 g/m² | 9 weeks | | Auto Blackberry Kush | Dutch Passion | 300-400 g/m² | 11 weeks | | Easy Bud | Royal Queen Seeds | 300-350 g/m² | 10 weeks |
Two units, two meanings: g/m² describes yield per square metre of canopy in a sea-of-green arrangement, while per plant is what a single auto produces. A 500 g/m² claim does not mean one plant yields 500 g; it assumes a full metre of canopy, often several plants.
What actually moves autoflower yield
1. Light (the big one)
Yield tracks light energy more than any other input. A single full-spectrum panel at proper distance - roughly 200 to 500 µmol/m²/s PPFD in veg, higher in flower as breeder guidance commonly suggests - is worth more than every other tweak combined.
2. Pot size
Too small a pot caps root zone and therefore plant size; 3 to 5 gallons (11 to 19 L) is the common indoor sweet spot for most autos. Going much larger indoors mostly raises your watering workload.
3. Genetics
Yield-focused autos like Auto Ultimate out-yield compact beginners' strains by design. That is a legitimate trade: see our best autoflower strains comparison.
4. Training
Low-stress training opens the canopy so more bud sites sit under stronger light. It reliably adds yield when started early; topping is riskier on autos. Method by method in our low-stress training guide.
5. Avoiding the yield killers
Overwatering, nutrient burn, transplanting and harvest-week heat or humidity each cost more than any optimisation adds. Our common autoflower mistakes and why are my autoflowers small guides cover the diagnosis.
Outdoor yields
Outdoor autos trade the grower's control for free sunlight and unlimited root run. Community reports and breeder claims for outdoor autos commonly range from 50 to 300 g per plant, with the low end typical in short or cloudy seasons and in small pots. Pot size and planting date dominate: a June-planted 5-gallon outdoor auto in most temperate climates is a modest plant; an early-season start in a large container can be a monster. Region-specific planning is covered in our growing autoflowers outdoors in Canada guide.
A realistic yield-planning table
| Setup | Realistic expectation per plant | |---|---| | First grow, 150-200 W LED, 3 gal pot | 1-2 oz (28-56 g) | | Second grow, 250-300 W LED, 5 gal pot, LST | 2-5 oz (56-140 g) | | Dialled-in 300 W+ per plant, training and good genetics | 5 oz+ (140 g+) | | Outdoor auto, 5-10 gal pot, temperate season | 1.5-10 oz (40-300 g) |
Treat the top row of any breeder chart as a ceiling under excellent conditions, not a promise. And remember dried yield: buds lose roughly 70 to 80 percent of their weight during drying and curing, so a plant that looks like a pound fresh usually dries to a few ounces.
For the full grow context behind these numbers, see the complete autoflower grow guide.
Frequently asked questions
What is the average yield of an autoflower plant?+
Based on consistent community reports, an indoor autoflower under a decent light typically yields about 1 to 5 ounces (28 to 140 g) of dried flower per plant. First-time growers under modest lights usually land in the 1 to 2 ounce range.
What does 500 g/m² mean for autoflowers?+
It is a breeder's claim for yield per square metre of canopy, not per plant, usually assuming ideal conditions and a full canopy. A single plant rarely reaches that figure; divide it across the plants that share a square metre.
How much do outdoor autoflowers yield?+
Commonly 50 to 300 g per plant, depending on pot size, sunlight and season length. Breeder claims up to 300 g per plant describe excellent outdoor conditions and large containers.
Do bigger pots mean bigger autoflower yields?+
Up to a point. Going from a 1-2 gallon pot to 3-5 gallons typically increases yield; beyond roughly 5 gallons indoors, gains shrink while watering workload grows. Root space matters most when it is otherwise limiting.
Written by the Autoflower.net Editorial Team. Information on this page is educational and does not replace strain-specific breeder guidance. Laws on cannabis cultivation vary by jurisdiction — check your local rules before growing.