I am surprised you have never heard of it, it's common in all the nurseries including Home Depot and Lowes!
Once it's settled in, it really doesn't need that much water, I have actually never heard of it needing lots, it's common for hanging baskets so that's not a high water plant but if it dries out too much it won't flower and I then cut it back and once it gets going again, it gets nice and lush as in my photo. I don't know what cultivar it is though.
http://www.bhg.com/gardening/p...
