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13,50€ – 63,50€Price range: 13,50€ through 63,50€
The original Nepalese Landrace was crossed with a touch of Jamaican ’85 to add vigor, yield, bluish colors and the classic positive Jamaican effect to the final hybrid, while maintaining the compact original Nepalese behaviour!
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| Weight | N/A |
|---|---|
| Genetic Type | Hybrid, Pure Sativa |
| Harvest Time | 8-10 Weeks |
| Harvest Yield | 400-500g/ m2, 500-600g / m2 |
| Seed Gender | Feminized Seed |
| Seedbank | ACE Seeds |
| Country | Spanish |
| Effect | Creative, Energetic, Social |
| Genetic Family | Landrace |
| Quality | Annibale's Choice, Easy to Grow |
| Taste and Smell | Lemon / Citrus, Spices / Incense / Cheese |
| Where to Grow | |
| THC | Low THC (10%), Mid THC (15%) |
Nepal Jam represents one of the zeniths of stabilization work (F8) conducted by ACE Seeds. The result of a cross between a Nepalese sativa and a Jamaica ’85, then backcrossed with the Nepalese line, this variety stands out for an extraordinarily compact structure for a sativa-dominant strain.
It is a genetic line designed to offer maximum climatic resistance in hostile environments, maintaining a fast flowering cycle and a bud density reminiscent of the best continental varieties.
Nepal Jam is a 60% sativa and 40% indica hybrid, prized for its botanical stability and ability to withstand significant thermal shocks. With an indoor flowering time of approximately 63 days, it offers consistent yields ranging between 400 and 500 g/m².
THC content is stabilized around 14-15%, making it a functional variety sought after for mental clarity and extreme resistance to cold, rain, and fungal pests. The structure is dense, with a very contained elongation rate during the transition to flowering.
As documented by ACE Seeds’ breeding logs and analyzed on Seedfinder, Nepal Jam is a long-term selection project lasting over ten years. The goal was to create a “mountain sativa” capable of flowering quickly even in northern climates.
The Nepalese component brings cold resistance and compact structure, while the Jamaica ’85 line (a classic sativa now almost extinct) introduces vigor and a creamy aromatic profile.
“A genetic line that transforms climatic resilience into consistent floral density.”
The stability achieved with the F8 generation makes it almost similar to a landrace in terms of phenotype uniformity. In a Nepal Jam population, differences between individuals are minimal, making it an ideal technical choice for those operating in large-scale or confined home cultivation systems.
In a controlled environment, Nepal Jam is one of the simplest sativas to manage. Unlike tropical sativas, it does not show an explosive elongation rate; it usually does not exceed 50-70% of the initial height after the photoperiod switch.
This characteristic makes it perfect for the Sea of Green (SOG) technique, where the focus is on the main apical bud production. The ideal setup involves using high-efficiency LEDs while maintaining a VPD between 1.1 and 1.3 kPa during flowering.
Although it tolerates heat well, Nepal Jam expresses its best with slightly cooler temperatures (22-24°C), which stimulate higher resin production. Nutrient consumption is moderate; excess nitrogen during the flowering phase can delay maturation and compromise aromatic quality.
Outdoors, Nepal Jam is a true “warrior.” According to grower experiences reported on ICMag, this variety can be successfully harvested up to the 45th parallel and beyond, thanks to its early maturation.
The root system is robust and shows excellent nutrient absorption even in poorer soils. Its resistance to botrytis (gray mold) and powdery mildew is among the highest in the ACE Seeds catalog, making it a guarantee for those growing in mountain areas or with rainy autumns.
The terpene profile of Nepal Jam is sophisticated and non-invasive. The dominance of Beta-Caryophyllene brings woody and spicy notes, while Alpha-Pinene contributes with pine resin and forest scents.
During the curing phase, the flowers develop a creamy aroma reminiscent of honey and caramel, inherited from the Nepalese component. The resin is dense and sticky, with trichomes that remain intact for a long time.
For those performing ice and water extractions, Nepal Jam offers superior qualitative returns, with the resulting hashish standing out for its malleable consistency and amber color.
The effect of Nepal Jam is traditionally associated with a sense of well-being and optimism. Many consumers report on Leafly a “warm” effect, similar to that produced by high-quality Nepalese charas.
It is not a variety that induces paranoia or tachycardia; the mental stimulation is accompanied by a muscular physical relaxation that never leads to lethargy. It is often sought after by those wishing to maintain focus during creative or social activities.
Users’ perception is that of a “clean” high, which fades gradually without leaving the mental heaviness typical of high-THC hybrids.
While Annapurna is a pure wild landrace, taller and with longer flowering, Nepal Jam is its “domesticated” and enhanced version. Jam offers much denser flowers and higher THC content.
Panama is significantly more potent and psychedelic, but also much harder to manage indoors due to elongation. Nepal Jam is the technical choice for those seeking reliability and shorter times.
Both are famous for ease of growth, but where Northern Lights offers a narcotic and heavy effect, Nepal Jam guarantees a lucid and stimulating sativa experience while maintaining a similar physical structure.
Nepal Jam is not recommended for growers exclusively seeking an extreme “stoned” effect or THC levels exceeding 25%. It is not the ideal variety for those desiring “candy” or chemical aromas typical of modern Cali quality.
Furthermore, those growing in hydroponics with very high nutrient regimes might find it sensitive to salt overloads compared to other commercial hybrids.
Absolutely yes. It is one of the most recommended varieties for outdoors in the Po Valley or pre-alpine areas due to its resistance to fog and humidity.
It is recommended not to exceed an EC of 1.6 – 1.8 in soil to avoid blocking the absorption of microelements.
The odor is present but less pungent than a Skunk or a Diesel, making it more discreet for indoor cultivation.
Yes, but given the limited elongation, the vegetative phase must be prolonged to properly fill the containment net.
ACE Seeds’ tests indicate stability between 14% and 15%, a real and consistent value among various individuals.
Nepal Jam is the “safety” in every experienced grower’s drawer. It is not the flashy advertising genetic, but it is the plant that never betrays you when the climate gets tough or when you look for a flower for daily consumption without losing productivity.
From an agronomic point of view, its stability is a pleasure to observe in the grow room. If you are looking for a sativa that behaves like an indica for ease and timing, but gives you the warmth of the Himalayan sun, Nepal Jam is the mandatory choice.
