Kent, United Kingdom

Hi: I bought a Hydrangea with black stems and lovely white flowers a couple of years ago and it is in a large pot. I have since lost the "identification label" it came with, so now have no idea what it is called, how to care for or prune it. Any ideas what it might be called please? I thought it was a Zorro, but now not so sure as it has two white flowerheads this year - and I thought Zorro was blue or pink. Thank you.

• 7 Sep, 2012