A worker of the San Lorenzo Packing Company checks and fills boxes with avocados that will be shipped to U.S. in the state of Michoacan, Uruapan, Mexico.

Avocado sales to China are expected to more than double this year as demand continues to grow for the fruit from the country's expanding middle-class population.

"It appears to just double every year, from what we've seen," Steve Barnard, president of Oxnard, California-based Mission Produce, the world's largest distributor of avocados. "It maybe more than double this year."

And, the pace of growth shows no sign of slowing as more health-conscious consumers in the world's most populous nation show an interest in the "heart-healthy" avocados, executives say. The fruit also appeals to "young, trendy people," said Barnard.

One big beneficiary of the growing demand is Mexico, the global leader in avocado production. Even through the U.S. market remains lucrative, avocado marketers in the Mexican state of Jalisco recently hosted a Chinese delegation in hopes of grabbing a piece of the action that now is dominated by the neighboring state of Michoacan.

"The Chinese market has been growing at a very fast pace," said Ramon Paz, an advisor for the Avocado Producers and Exporting Packers Association of Mexico (APEAM). "Our numbers show big growth but the total absolute numbers are still modest compared to other markets like the U.S. But of course the potential is huge."

According to Chicago-based researcher Technomic, "Avocado has evolved into a trending ingredient worldwide and has particular resonance in China — where it's commonly known as butter fruit — due to its somewhat exotic positioning."

Most of the demand in China is from "urban consumers" in the largest cities of Shanghai, Beijing and Guangzhou, said Paz. He said Chinese millennials who have traveled overseas also are helping to grow the market.

Still, Paz said the U.S. market remains a priority market for Mexican shippers for several reasons, including shorter transportation time, reduced risks and generally more favorable payment arrangements too. That said, he also indicated that demand for avocados also is strong in Japan and parts of Europe.

Mexico plans to ship 1.8 billion pounds of avocados to the U.S. in the current 2017-18 season, which runs from July 1, 2017 to June 30, 2018, according to Paz. By comparison, Latin American countries as a group shipped about 76 million pounds of avocados last season to China.

Even so, there's a risk that with all the Latin American avocados going to China it could one day increase the cost to American consumers. Mexican-grown avocados account for almost 80 percent of the creamy fruit sold in the U.S. market.

"It could affect it, yes, because it's pulling product out of Chile, Peru or Mexico that would would be available to ship here," said Barnard. And he added, "The Chinese pay pretty good — you get a premium."

The wholesale prices of avocado in the United States more than doubled last fall due to supply hiccups in Mexico. Supplies from Mexico ended up about 20 percent below the average last season and California's harvest was about half its usual amount, according to Paz.

"When you see 20 percent less, it has an impact in the market," said Paz. "We had a short crop basically because avocados have a tendency to produce more one year and less the next year. This year the Mexican crop is back to normal and California is forecasting a regular crop, although they had some problems with the recent wildfires."

Despite last year's higher prices, demand didn't fall off as Americans appear to be willing to pay more for their avocado and guacamole. Paz estimates avocado demand in the U.S. is growing about 10 to 12 percent per year.

Executives say there's also demand for avocados coming from other parts of Asia as well as Europe along with countries such as Argentina, which in the past two years has increased exports by around 50 percent from Chile.