In the early 20th Century lettuce grown south of San Jose was shipped across the country in refrigerated train cars. That lettuce was hailed as "green gold" in the Salinas valley.

John Steinbeck famously wrote about the Salinas Valley's fertile soil. Everything from produce to flowers have flourished here over the last hundred years.

But as the flower industry shifted to South America, it left many of the old greenhouses in Monterey County empty. That created the perfect opportunity for a different kind of plant, cannabis.

Brook Eagle is with Pacific Reserve, an organic nursery and cannabis flower grower.

"Probably a lot of these greenhouses hadn't been used in 25 years or more," said Eagle.

Read the complete article at ABC News.