Combined photo taken on April 4, 2013 shows various species of peony flowers at a park in Luoyang, capital of central China's Henan Province. Thursday is the first day of the three-day Qingming Festival holidays. [Xinhua/Wang Song]

Visitors view peony flowers at a park in Luoyang, capital of central China's Henan Province, April 4, 2013, the first day of the three-day Qingming Festival holidays. [Xinhua/Wang Song]

Visitors view peony flowers at a park in Luoyang, capital of central China's Henan Province, April 4, 2013, the first day of the three-day Qingming Festival holidays. [Xinhua/Wang Song]

Visitors view peony flowers at a park in Luoyang, capital of central China's Henan Province, April 4, 2013, the first day of the three-day Qingming Festival holidays. [Xinhua/Wang Song]