A man takes pictures of plum blossom at the botanic garden of Hangzhou, capital of east China's Zhejiang Province, Jan. 24, 2015. The temperature of Hangzhou reached 24 degrees Celsius Saturday, the highest of this winter. (Xinhua/Li Yabiao)

Photo taken on Jan. 24, 2015 shows plum blossom at the botanic garden of Hangzhou, capital of east China's Zhejiang Province. The temperature of Hangzhou reached 24 degrees Celsius Saturday, the highest of this winter. (Xinhua/Li Yabiao)

Photo taken on Jan. 24, 2015 shows plum blossom at the botanic garden of Hangzhou, capital of east China's Zhejiang Province. The temperature of Hangzhou reached 24 degrees Celsius Saturday, the highest of this winter. (Xinhua/Li Yabiao)

Photo taken on Jan. 24, 2015 shows plum blossom at the botanic garden of Hangzhou, capital of east China's Zhejiang Province. The temperature of Hangzhou reached 24 degrees Celsius Saturday, the highest of this winter. (Xinhua/Li Yabiao)

Photo taken on Jan. 24, 2015 shows plum blossom at the botanic garden of Hangzhou, capital of east China's Zhejiang Province. The temperature of Hangzhou reached 24 degrees Celsius Saturday, the highest of this winter. (Xinhua/Li Yabiao)

Photo taken on Jan. 24, 2015 shows plum blossom at the botanic garden of Hangzhou, capital of east China's Zhejiang Province. The temperature of Hangzhou reached 24 degrees Celsius Saturday, the highest of this winter. (Xinhua/Li Yabiao)

A man takes pictures of plum blossom at the botanic garden of Hangzhou, capital of east China's Zhejiang Province, Jan. 24, 2015. The temperature of Hangzhou reached 24 degrees Celsius Saturday, the highest of this winter. (Xinhua/Li Yabiao)

Photo taken on Jan. 24, 2015 shows plum blossom at the botanic garden of Hangzhou, capital of east China's Zhejiang Province. The temperature of Hangzhou reached 24 degrees Celsius Saturday, the highest of this winter. (Xinhua/Li Yabiao)

Photo taken on Jan. 24, 2015 shows plum blossom at the botanic garden of Hangzhou, capital of east China's Zhejiang Province. The temperature of Hangzhou reached 24 degrees Celsius Saturday, the highest of this winter. (Xinhua/Li Yabiao)

Photo taken on Jan. 24, 2015 shows plum blossom at the botanic garden of Hangzhou, capital of east China's Zhejiang Province. The temperature of Hangzhou reached 24 degrees Celsius Saturday, the highest of this winter. (Xinhua/Li Yabiao)