'fraid I don't know much about hydrangea's.
actually last year was my first year with an actual outdoor garden, I have always had a pretty green apt and balcony
Last year was great I learned a lot, grew some great vegetables, (hmmm I wonder will I start to glow in the dark?...see below)
Now I have a problem
I have to go to a garden meeting this thursday to find out if we can grow vegetables. Turns out the soil might be contaminated. Aye ya yae... after waiting almost 10 years for a communal garden, turns out I might have gotten one of the contaminated plots.
I hear there are some plants you can grow that will suck all the bad stuff in the soil. Going to have to do some research