How Long It Takes for Hydrangea to Change Colour? Can It Change Quickly?

Question

I want to do some experimenting on changing hydrangea colour. If the tree is already grown, can i still change the colour of the flower?

Answer 1

Yes, you can change the color at any time. This article will help with how to do that: https://www.gardeningknowhow.com/ornamental/shrubs/hydrangea/change-hydrangea-color.htm
 
It normally takes about a season to change the color.