The Sour Jack strain is a pure Sativa marijuana. The strain was created by Karma Genetics. This strain produces delicate, lime-green buds covered with orange trichomes. When smoked, the nugs delight with a pleasant taste of diesel and lemons, mixed with notes of tropical fruit. Indoors, Sour Jack marijuana takes 10 to 12 weeks to mature. The herb is very potent with THC levels up to 22%. Beginners should be mindful of the dose. Sour Jack is good for daytime use due to uplifting qualities.