Yunlin, Taichung, Miaoli and Changhwa are the main sweet potato producers. Hualien county is known for its unique varieties of sweet potato. Tea In 2013, Taiwan harvested about 15,000 tons of tea with a total value of NT$6.92 billion, of which 3,919 tons was exported. Taiwan's tea produces are oolong tea, pouchong tea, green tea and black tea. Taiwan began cultivating tea around two hundred years ago. Flowers In 2013, Taiwan harvested flowers with a total value of NT$16.52 billion, in which US$189.7 million of it was exported. Flower plantation land spreads over an area of 138 km2. Chrysanthemum floriculture takes the most land share among other types of flowers. Taiwan is the world's largest exporter of orchids, which represented 87% of the flower export value in 2013. The main export markets for Taiwanese flowers are the United States, Japan and the Netherlands. The export oriented flower market suffered during the COVID-19 pandemic with an increase in domestic consumption and government support necessary to keep the industry profitable. The Taipei Flower Market is the largest plant and flower market in Taiwan. The Taiwan Floriculture Development Association is the primary industry association. Livestock and poultry In 2013, Taiwan produced livestock and poultry with a total value of NT$150 billion. Taiwan's major livestock are pigs, and the major poultry is chickens, both as broilers and eggs. Taiwan exported 10,890 tons of animal products and imported 295,063 tons. 90% of pork consumed in Taiwan is domestically produced. Geese are a significant part of Taiwan's livestock and cuisine. Turkeys have been raised in Taiwan since partial Dutch colonization, production increased in the 1950s due to demand from US soldiers newly stationed in Taiwan. Turkey production remained significant after the drawdown in US forces. The Giant African snail was introduced to Taiwan by the Japanese in 1932 and have since formed a significant part of rural food culture. Only since the advent of commercial farming of the white-jade variety in the 1980s has consumption become widespread. Taiwan is a significant goat producer but produces few sheep, the mandarin for both species is yang (羊) which leads to little distinction between them in cuisine. Most local meat sold as mutton in Taiwan is in fact goat. Fisheries and aquaculture Aquaculture has a long history in Taiwan. By 2006 the production of Taiwanese coastal aquaculture was valued at NT$11,817 million. In the 21st century high technology is