<P> Blueberry bushes often require supplemental fertilization, but over-fertilzation with nitrogen can damage plant health shown by nitrogen - burn visible on the leaves . </P> <P> Significant production of highbush blueberries occurs in British Columbia, Maryland, Western Oregon, Michigan, New Jersey, North Carolina, and Washington . The production of southern highbush varieties in California is rapidly increasing, as varieties originating from University of Florida, Connecticut, New Hampshire, North Carolina State University and Maine have been introduced . Southern highbush berries are now also cultivated in the Mediterranean regions of Europe, Southern Hemisphere countries and China . </P> <P> According to a 2014 report by US Department of Agriculture, Washington was the nation's largest producer of cultivated (highbush) blueberries with 96.1 million pounds, followed in order of "utilized production" volume by Michigan and Georgia, Oregon, New Jersey, California and North Carolina . In terms of acres harvested for cultivated blueberries in 2014, the leading state was Michigan (19,000 acres) followed by Georgia, Oregon, Washington and New Jersey . </P> <P> Hammonton, New Jersey claims to be the "Blueberry Capital of the World, with over 80% of New Jersey's cultivated blueberries coming from this town . Every year the town hosts a large festival that draws thousands of people to celebrate the fruit . </P>

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