An author of how-to books on growing marijuana and avoiding the law was convicted Friday of marijuana cultivation and conspiracy charges.

The federal jury concluded that Ed Rosenthal, the self-described "Guru of Ganja," was growing more than 100 plants, conspiring to cultivate marijuana and maintaining a warehouse for a growing operation. Rosenthal, 58, faces a maximum of 85 years in prison when sentenced June 4.

'Guru of Ganja' convicted of cultivation