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Beginning of December Cannabis Seeds
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Strains tagged with a beginning-of-December outdoor harvest are ones where the breeder reckons they're ready around early December. These are almost always long-flowering types, usually sativa-leaning or equatorial lines, that need months and months to finish.
Most outdoor cannabis wraps up between September and November in places like the UK or northern Europe, but these genetics push way beyond that.
They come mainly from parts of the world where the growing season stretches on and on, and breeders have kept those slow-maturing traits alive in seed form.
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Where these strains evolved
These late finishers trace back to places near the equator, Southeast Asia, Central and South America, bits of Africa, where cannabis grew under steady daylight and warm weather all year round.
Sativa plants from those regions ended up with flowering cycles that can run ten, twelve, even fourteen weeks or more, way longer than the eight-to-ten-week window seen in indica types.
Those traits stuck around in landrace groups and later got refined by breeders working in mild spots like California's coastal valleys or Mediterranean zones, where autumn stays warm enough to let plants mature well into late autumn or early winter without getting hammered by frost.
Standout examples of beginning of December outdoor harvest strains
Super Silver Haze is probably the most famous one. It's a sativa-heavy mix of Skunk, Northern Lights and Haze genetics, and legal growers in California's Anderson Valley have become known for cutting it in December, braving increasingly cold and wet weather to let it finish completely.
The Haze side of its family tree is what pushes the flowering time out so long, and collectors love it for its complex smell and its history as a multiple Cannabis Cup winner.
Chocolate Thai is another notorious slow coach, a Southeast Asian landrace that can take up to fourteen weeks of flowering and often runs into December in the right climate.
It evolved in Thailand's equatorial belt, where plants had all the time in the world to mature, and breeders have kept those traits intact.
Colombian Gold is much the same story: a classic sativa landrace from Colombia's mountains that takes its sweet time, often reportedly stretching into early December outdoors in mild areas.
Dr. Grinspoon is a nearly pure sativa bred for extreme flowering duration and weird, airy, foxtail-shaped buds. Its breeder says it routinely finishes in late November or December and has become a bit of a collector's curiosity because of its unusual look and strength.
San Francisco Valley OG is a more modern hybrid that still leans sativa in its flowering time, and it's often mentioned as a challenging for legal growers because it matures so late.
Pure sativa strains in general, ones with hardly any indica in them, are said to need ten to fourteen weeks of flowering indoors, which translates to early-to-mid-November or December harvest windows outdoors in temperate zones.
Breeders working with these genetics often point out that in Mediterranean or warm coastal climates these strains can reliably be harvested into December, whilst those in colder regions face a much higher risk of mould and frost damage.
Autoflowering varieties are occasionally bred for late-season planting too. They complete their roughly 100-day lifecycle from seed to harvest.
What ties all these examples together is extended flowering duration, whether from landrace sativa heritage or deliberate breeding for late-season resilience, and a reliance on climates where autumn stays mild enough to support them.
Beginning of December Frequently Asked Questions
It's the breeder's estimate of when that strain will be ready outdoors, based on their own trials and the climate they tested it in. It's a catalogue tag, not a promise, and actual timing shifts due to various factors.
They're usually sativa-leaning or equatorial genetics with flowering periods of ten to fourteen weeks or longer. They evolved in regions with extended growing seasons and steady daylight, so they naturally finish later than faster indica varieties.
Mild climates with warm autumns, like coastal California, the Mediterranean, and parts of inland Spain, can support December harvests. Colder regions with early frosts and wet weather can't really accommodate such late maturation.
Many trace back to California's coastal valleys, Mediterranean breeding programmes, and preservation projects focused on equatorial landraces. Breeders in those areas have long worked with sativa genetics that naturally finish late in the season.
They have much longer flowering periods, often because of sativa-leaning genetics. While indica-heavy strains finish by late September or early October, these December varieties are said to require an extra four to eight weeks to complete their cycle.
Latitude affects daylight hours and temperature. A strain that flowers in July in California might not flower until August in Canada or Holland, delaying the whole cycle. December harvests are said to be most feasible in lower latitudes with milder autumns.
Yes. Autoflowers complete their lifecycle in roughly 100 days regardless of daylight hours, though that's a different genetic approach from traditional photoperiod sativas.
Its Haze lineage gives it an extended flowering period. It's also a multiple Cannabis Cup winner, making it a notable collector's item.
These strains evolved in equatorial regions with long, consistent growing seasons. Their genetics were shaped by environments where plants could mature slowly over many months, resulting in flowering periods that extend well into late autumn or early winter.
Indica-dominant strains typically mature faster than Sativa types and usually finish well before December outdoors. Their shorter flowering periods mean they're ready earlier in autumn. Legal growers seeking December harvests generally look to Sativa genetics or specially timed autoflower plantings.