Jack is back in autoflowering form! This uplifting, easy to grow Sativa takes up to 7-8 weeks to finish flowering and can grow to 3.5 feet high, small enough to fit into any size room. Jack Herer Autoflower Strain is a must-try due to its high yields both inside and outdoors, as well as its high THC content. Already persuaded? Along with a wide selection of other autoflower seeds, Crop King Seeds offers Jack Herer Autoflower Strain seeds for sale.