The caretaker where I live noticed that my hydrangea has started to get a slight pinkish tinge to it's petals and said that I should put a rusty nail through it's roots to change it back to blue.
Does this really work, and are there any other methods?
I think ihave heard of rusty nails and blue flowers before.
Any advice welcome
Thanks in advance.
(The photo was taken when it was brand new so the pink tinge cannot be seen in this photo.)
- 6 Jun, 2011