About a dozen people gathered around a table in a St. Louis conference room Saturday morning, pulling out notebooks and settling in for a four-hour crash course on growing medical marijuana.

Instructor Zachery Post gave a PowerPoint presentation in the Cortex Innovation District. He explained basic cannabis terminology and how things like temperature and lighting have different effects on the plant.

He’s the president of Elite Home Growers Academy, and he started giving workshops like these last year. 

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Corinne Ruff ~ St. Louis Public Radio ~