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12/12 Photoperiod Cannabis Seeds
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12/12 photoperiod cannabis seed strains need equal hours of light and darkness to start flowering.
These seeds follow seasonal light changes in nature, which makes them different from autoflowering types that bloom based on age alone.
Photoperiod genetics give collectors a wide range of classic and modern types, each with its own special traits.
Read MoreUnderstanding 12/12 photoperiod cannabis traits
Photoperiod cannabis strains flower when they sense a shift to about twelve hours of light and twelve hours of darkness each day.
This natural pattern copies the change from summer to autumn outdoors. Indicas, sativas, and hybrids all fall under the photoperiod group. Each brings different growth patterns and finish times.
Some photoperiod lines stretch tall and airy. Others stay short and bushy. Breeders have improved these traits over many years, creating stable genetics that perform the same way under steady schedules.
Collectors like 12/12 photoperiod seeds for their genetic variety and the rich history in their family trees.
Photoperiod cannabis lineage and genetics
Classic photoperiod strains come from landrace populations in Afghanistan, Thailand, Colombia, and other cannabis regions.
Modern breeders cross these old-school plants with newer hybrids to balance strength, smell, and resin. Indica-heavy photoperiods often come from Afghan or Kush lines, known for thick structure and earthy scents. Sativa-leaning types may carry genetics from areas near the equator, offering brighter, more citrus-like profiles.
Hybrid photoperiods mix both sides, aiming for middle-ground flowering times and balanced traits.
Seed banks look after these family lines carefully, keeping genetic quality across feminised, regular, and sometimes fast-flowering photoperiod versions.
Available formats for 12/12 photoperiod seeds
Photoperiod cannabis seeds come in feminised, regular, and sometimes fast-version formats. Feminised seeds make nearly all female plants, which makes collection easier for hobbyists.
Regular seeds give both male and female plants, which appeals to breeders who want to create new crosses or save old lines.
Fast-flowering photoperiods shorten the bloom time a bit while keeping photoperiod behaviour. Pack sizes range from single seeds to bulk choices, letting collectors start small or stock whole genetic libraries.
Each format fits different collecting goals, whether someone wants one rare type or a diverse seed collection.
12/12 Photoperiod Frequently Asked Questions
It describes cannabis strains that begin flowering when exposed to twelve hours of light and twelve hours of darkness each day. This copies natural autumn conditions.
Yes. Cannabis seeds are legal to purchase, own, and collect in the UK as novelty items, provided they are not germinated.
Most flower well under a schedule, though some sativa-heavy lines may handle slightly shorter dark periods. Twelve hours is the standard mark.
Feminised seeds make almost only female plants. Regular seeds give a mix of males and females, useful for breeding projects.
Kept cool, dark, and dry, photoperiod seeds stay good for years, making them great collectibles.
Indica-leaning types may finish in eight weeks, while some sativas take twelve weeks or longer under light.
No. Fast photoperiods still need a light shift to flower; they simply finish a week or two earlier than standard photoperiod versions.
Profiles range from earthy and piney in indicas to citrus, tropical, and floral notes in sativas. Hybrids blend these smells in countless ways.
Photoperiods offer deeper genetic variety, classic family lines, and the option to keep mother plants for cloning purposes.
Packs usually contain one, three, five, or ten seeds. Bulk options are available for collectors building large libraries.