Is it too cold to plant out potted hydrangeas, and if I want to add blueing agent to keep it blue, will the compound affect other plants? Thanks.
I cannot say if it is too early to plant out your hydrangeas...for I have no idea where you live...but in my country folks have begun buying and planting them out already. I do not believe that the bluing agent will necessarily affect other plants if they are not right up against your hydrangea. I will say though, that most bluing agents that I know of lower the soil pH, making it acidic. You do not want chalk (alkaline)-loving plants near to this, naturally. Good luck with your Hydrangeas...and let us know how you get on.
