Hydrangea 繡球花

Hydrangea繡球花 (common names Hydrangea and Hortensia) is a genus of about 70–75 species of flowering plants native to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and North and South America. By far the greatest species diversity is in eastern Asia, notably China, Japan, and Korea. Most are shrubs 1–3 m tall, but some are small trees, and others lianas reaching up to 30 m by climbing up trees. They can be either deciduous or evergreen, though the widely cultivated temperate species are all deciduous.
其性喜陰濕，且對二氧化硫等有害氣體抗性強。不可接受過強之直射陽光，否則葉片易灼傷。繡球花的花色可隨土壤的pH值而改變。若在酸性土壤種植(pH值比7小)，花色是藍色；若在中性土壤種植(pH值大約等於7)，花色是乳白色；若在鹼性土壤種植(pH值比7大)，花色是紅或紫。因此可通過調節土壤的pH值來改變花色。可用扦插法繁殖。
其全株有毒，誤食會導致疝痛、腹痛、腹瀉、呼吸急促、嘔吐、便血等中毒癥狀。

花語： 希望、家族的團聚
變花色：
藍色
* 夏秋時期，每週施用一次稀釋硫化鐵溶液（1000倍以上），當花萼細胞鐵元素增加，花色便會漸漸轉為藍色。
* 植株旁埋幾根生鏽鐵釘。
* 換盆時混入少量硫化鋁或硫化鎂。
土壤ph值大於7是鹼性.花開變藍色.

紅色

換盆時壤土依盆土多寡加入少於1/3茶匙以下的碳酸鈣(即石灰石)的粉末。土壤ph值小於7是酸性.花開變桃紅色.