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Here's a link about Hydrangeas (scientific name: Hydrangea sp.) - http://en.wikipedia.org/wiki/Hydrangea.
i have these in my garden and they can be altered to change to blue using epson salts .or deep purple they also come in smaller flowerheads .can be planted cool areas die back with the frost but come back in spring also easy to propergateusing the old wood .hope that helps .cheers from victoria australia