This report contains the results of a comprehensive study of marihuana cultivation in British Columbia undertaken and completed in two parts. The first part, which covered the four- year period of 1997 – 2000 was completed in the summer and fall of 2001. The results from that time period were first reported in Marihuana Growing Operations in British Columbia: An Empirical Survey (1997- 2000) by Plecas et al. (2002). The methodology of the second part of the project, covering the period from 2001 through 2003, remained unchanged. The second part of the project was conducted over the summer and fall of 2004. Overall, the project involved a review of all cases of alleged marijuana cultivation coming to the attention of the police from January 1, 1997 to December 31, 2003. In all, 25,014 cases from this seven-year period were reviewed. The main findings are summarised below.