I just planted my first Hydrangea (Nikko Blue) Its came in a one gallon, I planted it in a shady area that gets mostly deep shade, but the last 3 hours of sunlight a day will reach it. I was wondering how long until its full grown. How much do Nikko Blues take to reach the 6'X6' I have seen them at? Its about 15in now, starting to bud and get leaves. Sorry, but I am new to gardening! Thanks again!