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Cannabis Flower Anatomy: Pistils, Calyxes, Bracts & More Photoperiod vs Autoflower Cannabis
Photoperiod and autoflower are the two main genetic categories of cannabis plants. The difference comes down to how they decide when to start flowering. Here’s how each type grows and which is better for different cultivation goals.
Key Details
How Photoperiod Cannabis Works
Traditional cannabis — both indica and sativa — is photoperiod-dependent, meaning it flowers based on the length of day and night. Outdoor plants sense shortening daylight in late summer and autumn as the signal to stop vegetating and start producing flowers.
Indoor growers replicate this by controlling the light cycle. Plants stay in a 18/6 or 20/4 light schedule during vegetation, then flip to 12/12 to trigger flowering. This gives indoor growers complete control over when each plant flowers, regardless of season.
How Autoflower Cannabis Works
Autoflower plants flower based on age rather than light cycle. They typically start flowering 3–5 weeks after germination and finish within 7–12 weeks total from seed.
This is because autoflower genetics include Cannabis ruderalis — a wild hemp subspecies from northern Russia and Eastern Europe that evolved to flower quickly during short summer growing seasons. Modern autoflower breeders cross ruderalis with indica or sativa genetics to add potency and flavor.
Yield and Quality Differences
Photoperiod plants can be vegetatively grown as long as the grower wants — some growers veg for weeks or months to grow massive plants before flipping to flower. Yields per plant are typically higher.
Autoflowers finish faster but produce smaller plants and smaller harvests per plant. Modern autoflower genetics have closed the potency gap considerably — high-quality autoflowers can reach 20%+ THC — but they still usually yield less than photoperiod equivalents.
Pros and Cons
Photoperiod pros: bigger yields, more genetic diversity, higher maximum potency, can be cloned (autoflowers can’t be reliably cloned). Cons: longer total cycle, require light-cycle control, more sensitive to lighting mistakes.
Autoflower pros: fast total cycle (sometimes 10 weeks seed-to-harvest), can run 20/4 lights all the way through (no light switch needed), forgiving for beginners, great for stealth and small grows. Cons: smaller yields, harder to clone, limited training options.
Which Is on the Menu?
Most commercial cannabis — including every jar at Social Dispensary — is photoperiod genetics. Commercial growers favor the higher yield, the cloning ability (every plant is genetically identical to the mother), and the fuller genetic potential.
Autoflowers are more common among home growers, outdoor seed-starters, and anyone running a grow on a tight timeline. If you see an ‘auto’ variant in strain lineage notes, that’s an autoflower cross.
Frequently Asked Questions
What’s the difference between photoperiod and autoflower?
Photoperiod plants flower based on light cycle (shortening days trigger it). Autoflowers flower based on age, regardless of light.
Are autoflowers weaker than photoperiod?
Not anymore — modern autoflower genetics can reach 20%+ THC. Historical autoflowers were weaker, but breeding has closed the gap.
Can you clone an autoflower?
Not reliably. Autoflowers flower based on age, and clones retain the age of the mother plant — they flower almost immediately and produce poorly.
Which is easier to grow?
Autoflowers, generally. They don’t require light-cycle control and finish quickly. Photoperiod plants give more control and bigger yields but require more experience.
Does Social carry autoflower strains?
Commercial cannabis sold at dispensaries, including Social Dispensary, is almost always photoperiod. Autoflowers show up mostly in home-grow seed catalogs.
Related Reading
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Educational content for adults 21 and over. This article is informational and is not medical advice. Cannabis affects everyone differently. Statements about cannabis on this page have not been evaluated by the Food and Drug Administration. Cannabis is not intended to diagnose, treat, cure, or prevent any disease. If you have a medical condition, talk with a licensed healthcare provider before using cannabis. Do not drive or operate machinery after consuming. Keep cannabis products away from children and pets.
