牡丹花期较短,故有“养花一年,看花十天”之说。据观察,牡丹在开花前后对温度最敏感,而且最怕烈日曝晒。当天气晴好、气温持续超过24℃时,不仅花瓣变软,而且会加速凋谢。尤以深色花(紫红、深紫红)最易受害。即使 Peony flowering period is shorter, so there is “to spend one year to see flowers ten days,” said. It is observed that the peony before and after flowering is the most sensitive to temperature, but most afraid of the sun exposure. When the weather is fine, the temperature continues to exceed 24 ℃, not only the petals become soft, but also accelerated withering. Especially dark flowers (purple, deep purple) the most vulnerable. even if