'Master growers' cultivating a higher grade of marijuana

A new breed of connoisseur is producing pot that is potent, tastes smooth and has a pleasing aroma — the kind of product now expected by ever-more discriminating consumers who frequent medical cannabis dispensaries.

Behind the bolted steel doors of an old brick warehouse, Big Wes meets a nutrient company scientist to see if he can increase his crop yield. Rows of hydroponic marijuana plants soak up solution flowing through plastic troughs and light blazing from high-pressure sodium lamps.

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