Nine living marijuana plants will be displayed at the Oregon State Fair in a first-of-its-kind event for the United States.

The exhibit of the immature plants brings pot cultivation into the agricultural mainstream less than two years after Oregon voters legalised recreational marijuana.

The Oregon Cannabis Business Council said it is the first time live cannabis will be shown at a US state fair.

The plants will be housed in a translucent tent with extra security, Oregon State Fair spokesman Dan Cox said. No-one under 21 will be allowed into the display and the plants may not have any buds.

Recreational marijuana remains illegal in 46 states but the business is booming in Oregon, which recently quadrupled its recreational marijuana net state tax revenue estimate.

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