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The Santa Barbara County Sheriff's Office says it ended up destroying 350,000 plants and seizing 20 tons of processed cannabis from the operation.
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Investigators say the grow was a year-round operation and they are now looking for the property owner.
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Officials are also looking into whether the grow had fraudulently obtained cannabis licenses from the state and made illegal sales.
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So far, no arrests have been announced.
Buellton is about 40 miles northwest of Santa Barbara.