Middle of December Cannabis Seeds

Where these strains evolved

How did these late-season lines end up needing so much time? Strains that mature around mid-December mostly trace their roots back to equatorial and subtropical regions, where long, warm growing seasons let sativa lines develop extended flowering cycles.

Southeast Asian landraces, for instance, evolved in climates with consistent heat and daylight, which led to genetics that can take 12 to 14 weeks to flower.

Breeders working in temperate zones with milder autumns, like parts of the Mediterranean, inland Spain and California, have preserved and refined these long-season lines, picking plants that can finish outdoors even as daylight shortens and temperatures cool.

Some hybrids blend these sativa foundations with faster-finishing indica genetics, creating strains that still need late-season timing but offer slightly more compact structure.

Standout examples of mid-December harvest strains

Which strains really shine in this late-season window? Chocolate Thai is a classic Southeast Asian landrace that needs up to 14 weeks of flowering, making it a natural fit.

Its lineage comes from Thailand, where warm, stable conditions let the strain develop its long cycle and distinctive resin character.

DJ Short, the breeder behind Blueberry, has mentioned that whilst his indica-leaning Blueberry finishes in mid-to-late October in Oregon, he waits until late November or even December to collect certain sativa strains, letting them reach full maturation.

These sativa lines are said to benefit from the extra time, building higher concentrations of cannabinoids and terpenes as the season rolls on.

Frisian Dew, a Dutch outdoor strain, is usually ready around late September or early October in the Northern Hemisphere, but in milder climates or when planted later in the season, it can stretch into November and beyond.

Auto Mazar, an autoflower with Afghani Kush genetics, completes its cycle from seed to harvest in around 100 days and has been proven outdoors across diverse regions from the Mediterranean to Scandinavia.

In warm Mediterranean climates, breeders have developed strains specifically for late outdoor starts, enabling harvests in November and December.

These lines often carry sativa-dominant or sativa-hybrid genetics, which naturally need longer flowering periods and thrive in regions where autumn stays warm and dry.

Strains suited to December harvest are particularly valued in areas with rainy periods during early autumn, by maturing later, they dodge the peak fungal pressure that hits faster-finishing varieties.

Northern California outdoor legal growers, for example, enjoy extended harvest windows into late season thanks to the region's relatively warm weather patterns, and many choose long-flowering sativas to take full advantage of the climate.

The extended flowering period also lets these strains accumulate higher levels of resin and terpenes, as the plant continues its cycle well into late autumn.

Pure sativa strains can need 10 to 14 weeks of flowering, and outdoors they may not reach full maturity until early to mid-November or even December in temperate regions.

Indica strains, by contrast, mostly flower faster, some varieties complete their cycle in 7 to 8 weeks, and harvest earlier in the season, often by the end of September.

Hybrid strains offer flexible harvest windows, and some mature late enough to reach December in temperate outdoor environments, especially when breeders have emphasised sativa traits in the cross.