Meet Critical Jack, a lively, mostly Sativa hybrid with bright flavor, resin-packed buds, and an energizing edge. Its 20% THC profile pairs a clear, focused mood with an easygoing sense of relaxation. Feminized seeds, vigorous growth, and a practical 8–10-week flowering window make this a rewarding pick for new and experienced growers alike.
Our breeders bring together Critical+ and Jack Herer for a 60% Sativa, 40% Indica balance. The result carries Jack Herer’s lively character alongside Critical+ vigor and generous production. Expect a tall, open-growing plant that can reach 3 m outdoors, with plenty of room to flourish.
A bright floral, lemon, and pine lift meets a lush mix of berry, fruit, sweetness, and tropical notes. The aroma is fresh and expressive, while dense buds develop a frosty coat of resinous trichomes. Each harvest delivers plenty of sensory character for flower lovers and extract makers.
Critical Jack offers an energetic, focused experience with a relaxed finish. Its uplifting character suits daytime plans, creative projects, and moments when you want to stay engaged. With THC around 20%, it brings satisfying potency without losing its bright, clear-headed feel.
A layered terpene profile includes Terpinolene, Alpha-Pinene, Bisabolol, Terpineol, Eugenol, and Nerolidol, alongside several other aromatic compounds. Together, they contribute to the strain’s lively citrus, floral, and sweet-fruit character. Many consumers choose Critical Jack for a cheerful, focused session or a relaxed evening wind-down.
These feminized seeds are designed to produce female plants, helping simplify planning and make the most of your grow space. Critical Jack suits indoor and outdoor gardens in temperate conditions. Every Grassfarmer seed purchase comes with our germination guarantee, so you can start your grow with confidence.
Give seedlings a quality, well-draining medium such as coco, peat, or a soil blend with perlite. Keep temperatures steady and airflow fresh as plants establish. Critical Jack welcomes gentle training as it grows; indoors, a ScrOG setup can help spread the canopy and bring lower flowering sites into stronger light.
Plan for vertical space. This vigorous, Sativa-leaning plant can stretch tall, so monitor its height and shape the canopy early. Provide strong light indoors or at least 6–8 hours of direct sun outdoors. Keep humidity in check and maintain good air circulation as the foliage thickens.
Flowering typically takes 8–10 weeks. Indoor growers can target yields of up to 650 g/m², while outdoor plants can produce around 900–1,200 g each in favorable conditions. In the Northern Hemisphere, harvest usually arrives in October. Dense, resin-rich buds reward steady care through the final weeks.
Grassfarmer offers Critical Jack in small and bulk quantities, with premium genetics selected by expert breeders at prices built for value. We ship fast and discreetly, with guaranteed delivery in the USA, Canada, the European Union, and the U.K. Bring home this bright, productive hybrid and get your next grow moving.
