Blackwater OG is a strain that was bred with the sole intention of creating the darkest purple version of OG Kush available. Mendo Purps was used as a cross with the OG Kush, and the project was a success depending on what phenotype you end up with. All versions of Blackwater OG have a strong OG Kush smell with skunky grape undertones, Taste/Effects: Blackwater OG is an easy smoke for sure, but the musky lemons and grape flavor lacks the fullness in flavor expected from the smell given off by the buds. The high is mostly cerebral, but if overdone Blackwater OG does not hesitate in putting you to sleep. Potency is medium to high, with an average duration lasting a little under two hours. Growing: As mentioned above there are a few phenotypes of Blackwater OG running around. Be sure to find out what phenotype you are growing as soon as possible to properly tend to your plant’s needs. Some Blackwater OG phenotypes do not turn purple at all; do not be discouraged, they still produce quality medicine. Blackwater OG.