GOLETA, Calif. — There is a new crop growing in Southern California’s famous avocado groves — coffee.

About two dozen farms between San Diego and here, just outside Santa Barbara, are nurturing coffee bushes under the canopies of old avocado trees, in what may be the first serious effort in the United States to commercialize coffee grown outside Hawaii, home of Kona coffees.

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The farmers are hoping to capitalize on a variety of changing factors abroad and here, including the aging of California’s avocado trees, which are producing less fruit.

The avocado growers face major disruptions in their business, including increased competition from Mexican imports, less access to water and rising real estate prices, all of which are forcing them to rethink that crop. But thanks to Mr. Ruskey, they have realized that their sprawling avocado trees provide perfect shade for high-quality coffee bushes.

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