Black Forest High is a breed of marijuana grown a woman described (by those who do not know her well, which is nearly everyone) as “a little old lady from Pasadena”. In actuality, the woman in question is more or less ageless. Her name is Agnes, and just by coincidence, she’s a witch. A murderous cannibalistic Nazi witch.
The Black Forest High was grown in the basement of her house, which was extensive as a result of having been originally constructed as a funeral home with a large attached bomb shelter, and fertilised with the remains of the young humans killed by the witch. At the present time, all known samples of Black Forest High have been destroyed, but Agnes is still out there, somewhere. Only time will tell when she returns and whether she’ll bring her drug with her.