Ineffectiveness of hydrangea colourant

Last year I used hydrangea colourant to turn my deep pink mophead hydrangea blue. I diluted it in accordance with the instructions and applied it once a week from early May to early July. To my disappointment the flowers turned out mauve-purple rather than blue.

I tried again this year in the belief it would take another season to make the soil acidic. But this summer the flowers were actually pinker than last year!

Where did I go wrong? The only thing I can think of is that I didn't fork around the roots before applying the colourant.

Reply to
David56802
Loading thread data ...

HomeOwnersHub website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.