How to Grow Jack Herer
Named after cannabis activist Jack Herer, this award-winning sativa hybrid delivers spicy pine aromas and energising cerebral effects.
Jack Herer Grow Timeline
Jack Herer Seeds & Genetics
Genetics: Haze x Northern Lights #5 x Shiva Skunk | Breeder: Sensi Seeds | Type: Sativa-dominant Hybrid
Jack Herer was created by Sensi Seeds as a tribute to cannabis activist Jack Herer through a complex cross of Haze, Northern Lights #5 and Shiva Skunk. It won nine Cannabis Cup awards and became the benchmark for sativa hybrids in Europe. Seeds are available feminised and autoflowering from Sensi Seeds and licensed partners. Visit our beginner cannabis growing guide for germination instructions. Seeds sprout in 3-7 days.
Indoor vs Outdoor Growing Jack Herer
Jack Herer is a tall sativa requiring active height management indoors. Top at the 4th-5th node and implement SCROG - our SCROG guide covers the full setup. Flip to 12/12 after 4-5 weeks of veg. Outdoors, Jack Herer is a powerhouse in Mediterranean climates finishing in late October. Our outdoor growing guide covers spacing and support for tall sativa plants.
Nutrients & Feeding for Jack Herer
Jack Herer has moderate-to-high nutrient demand. In veg, nitrogen-dominant at EC 1.2-1.8. Transition to bloom nutrients as flowering begins. Silica supplementation strengthens stems. Flush 10-14 days before harvest. See our cannabis nutrients guide for a full schedule.
Common Problems & Solutions
Height is the primary indoor challenge - without training Jack Herer can outgrow grow tents. Maintain stable 12/12 lighting to avoid hermaphroditism. Keep humidity below 50% in flowering. Inspect weekly for spider mites on dense foliage.
Harvest, Drying & Curing Jack Herer
Harvest when trichomes are 80-85% cloudy with minimal amber to preserve cerebral effects. Dry in ventilated dark room for 10-14 days. Cure in glass jars for 4-6 weeks. Full details in our harvest guide.
Full terpene profile, effects and uses of Jack Herer.
Terpenes & Effects
Frequently Asked Questions
Is Jack Herer hard to grow?
Jack Herer is moderately challenging due to its sativa height and longer flowering time, but its resilience and consistent genetics make it manageable for intermediate growers.
How long does Jack Herer flower?
Jack Herer flowers in 8-10 weeks indoors. Some sativa-dominant phenotypes may take up to 11 weeks.
What yield does Jack Herer produce?
Expect 400-500g/m2 indoors with proper training. Outdoor plants in warm climates regularly exceed 500g per plant.
How tall does Jack Herer grow?
Jack Herer can reach 130-180cm indoors and even taller outdoors. Height management via topping and SCROG is strongly recommended.
What does Jack Herer smell like when growing?
Jack Herer produces a spicy, pine-forward aroma with herbal and earthy undertones during late flowering. Carbon filtration is essential.
Is Jack Herer good for outdoor growing?
Yes, Jack Herer thrives outdoors in warm, sunny climates and finishes by late October. Its sativa heritage means it needs a long growing season.