Jack F1

Jack F1 - Spliff Seeds

Jack F1 by Spliff Seeds is a mostly Sativa strain created by crossing Skunk #1, Northern Lights and Mexican Haze. The Dutch breeder developed these special genetics over several generations through targeted backcrossing with the original parent lines to achieve the greatest possible uniformity among the offspring. The result is a mostly Sativa strain distinguished by its exceptional combination of classic Haze characteristics and a more Indica-like appearance. While Mexican Haze contributes the characteristic Sativa influence, Northern Lights and Skunk #1 add more compact growth traits and a vigorous plant structure to the cross. Particularly interesting is the relatively low odour production during growth, which the breeder specifically highlights. At the same time, Spliff Seeds describes the strain as very vigorous, meaning it may require a little more attention depending on the growing conditions.

The aroma of Jack F1 combines sweet and spicy notes with a delicate hint of cinnamon. While the scent of the living plants can be relatively subtle, the flavour profile reveals a considerably more complex combination. Sweet accents meet pleasant spiciness, while its Mexican Haze heritage contributes a subtle, classic Haze undertone. This combination of sweet spice, cinnamon nuances and light Haze aromas gives Jack F1 its distinctive character.

Lineage: Skunk #1 x Northern Lights x Mexican Haze
Genetics: mostly Sativa
Flowering: 9 - 10 weeks
Smell: sweet, spicy, cinnamon, Haze
THC: 22%

Spliff Seeds: Amsterdam Breeding Since the Nineties

Spliff Seeds started back in 1995 in Amsterdam. Two growers, Marcel and Erik, set it up and gave it a logo that people still remember because it is probably the funniest one in the seed scene. From the very beginning, their idea was simple: keep prices fair but make sure the genetics stay strong. They choose their parent plants carefully, then test them over and over before anything is released.

Quick Facts
Location: Amsterdam, Netherlands
Focus: Feminized and regular cannabis seeds
Types Available: Feminized, regular, and autoflowering for Northern Europe
Well Known For: Medical Kush, Strawberry, Fast Bud Outdoor, White Widow Auto, Mega Power Plant Auto
Works Well For: Growers looking for strains that are reliable, easy to grow, and carry high THC levels

Every batch goes through sorting by hand and repeated germination checks. They only put out fresh seeds that can be counted on. Some growers choose them for the simple growing process, others for the THC punch. Either way, the catalog is straightforward and solid. Incidentally, many varieties of spliff are ideal for growing on the balcony.