Tulip blossom at the Beijing International Flower Port in Beijing, capital of China, April 29, 2013. A tulip cultural gala was held here, presenting over 4 million tulips from more than 100 species. (Xinhua/Luo Xiaoguang)

Tulip blossom at the Beijing International Flower Port in Beijing, capital of China, April 29, 2013. A tulip cultural gala was held here, presenting over 4 million tulips from more than 100 species. (Xinhua/Luo Xiaoguang)

Tulip blossom at the Beijing International Flower Port in Beijing, capital of China, April 29, 2013. A tulip cultural gala was held here, presenting over 4 million tulips from more than 100 species. (Xinhua/Luo Xiaoguang)

Tulip blossom at the Beijing International Flower Port in Beijing, capital of China, April 29, 2013. A tulip cultural gala was held here, presenting over 4 million tulips from more than 100 species. (Xinhua/Luo Xiaoguang)

Tulip blossom at the Beijing International Flower Port in Beijing, capital of China, April 29, 2013. A tulip cultural gala was held here, presenting over 4 million tulips from more than 100 species. (Xinhua/Luo Xiaoguang)

Tulip blossom at the Beijing International Flower Port in Beijing, capital of China, April 29, 2013. A tulip cultural gala was held here, presenting over 4 million tulips from more than 100 species. (Xinhua/Luo Xiaoguang)

Tulip blossom at the Beijing International Flower Port in Beijing, capital of China, April 29, 2013. A tulip cultural gala was held here, presenting over 4 million tulips from more than 100 species. (Xinhua/Luo Xiaoguang)

Tulip blossom at the Beijing International Flower Port in Beijing, capital of China, April 29, 2013. A tulip cultural gala was held here, presenting over 4 million tulips from more than 100 species. (Xinhua/Luo Xiaoguang)

Tulip blossom at the Beijing International Flower Port in Beijing, capital of China, April 29, 2013. A tulip cultural gala was held here, presenting over 4 million tulips from more than 100 species. (Xinhua/Luo Xiaoguang)

Tourists walk on a pathway in the flower fields at the Beijing International Flower Port in Beijing, capital of China, April 29, 2013. A tulip cultural gala was held here, presenting over 4 million tulips from more than 100 species. (Xinhua/Luo Xiaoguang)

Tulip blossom at the Beijing International Flower Port in Beijing, capital of China, April 29, 2013. A tulip cultural gala was held here, presenting over 4 million tulips from more than 100 species. (Xinhua/Luo Xiaoguang)

Tourists walk on a pathway in the flower fields at the Beijing International Flower Port in Beijing, capital of China, April 29, 2013. A tulip cultural gala was held here, presenting over 4 million tulips from more than 100 species. (Xinhua/Luo Xiaoguang)

Tulip blossom at the Beijing International Flower Port in Beijing, capital of China, April 29, 2013. A tulip cultural gala was held here, presenting over 4 million tulips from more than 100 species. (Xinhua/Luo Xiaoguang)

Tulip blossom at the Beijing International Flower Port in Beijing, capital of China, April 29, 2013. A tulip cultural gala was held here, presenting over 4 million tulips from more than 100 species. (Xinhua/Luo Xiaoguang)