I have used this before it does work well would recommend

Only arrived yesterday afternoon, looks ok but I haven’t used it yet

I bought this product to treat a 'Blue Boogie Woogie' Hydrangea that had been planted in a pot of ericaceous compost two summers ago but was starting to turn pink. I have mulched with more compost and treated with the Vitax and the colour is gradually reverting to blue but after a few weeks it still has not regained its startling 'blueness' so patience is probably required!This is not a cheap product considering how much you need for a fairly small pot and you may need to repeat the treatment periodically. If you have your hydrangea planted in the garden and don't have acid soil you are wasting your money by fighting with nature (you won't win) so maybe try the cheaper options of adding spent coffee grounds/crushed egg shells in an attempt to change the ph around your plant.Good luck

Worked a treat. We had beautiful, blue hydrangeas blooming all summer long.

It works on my hydrangers