OB Haze Strain. OB Haze ( the phenotype of Amnesia Haze). OB most likely refers to Ocean Beach, making it a local strain. Sativa dominant hybrid comes from Amnesia and a Sativa Haze Strain from Laos, and Jamaican. Patients love this Strain for its unforgettable smell and taste. Patients are treated to an uplifting, cerebral experience. Creative thoughts flow, and patients report the being more socially interactive. OB Haze has a relatively long growth cycle at about 10-11.5 weeks, so growers must remain patient for success, but will be rewarded with yield worth waiting for. OB Haze has large, dense buds that are saturated with crystals. The original OB Haze seeds can only be offered at a few seed providers. Growing OB Haze Marijuana Has Medical Benefits.