Hydrangea (/haɪˈdreɪndʒⁱə/;[1] common names hydrangea or hortensia) is a genus of 70–75 species of flowering plants native to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. By far the greatest species diversity is in eastern Asia, notably China, Japan, and Korea...color change of the flower pigments in the presence of aluminium ions which can be taken up into hyperaccumulating plants...normally they are dark pink colors with lauze,it turn on blue.