The Garden Community for Garden Lovers

By Emsart

United Kingdom Gb

What makes hydrangeas change colour.
rose to blue. blue to rose



acidity/alkylinity. An acid fertilizer will promote blue flowers and the opposite, pink. My reference are the bottles of fertilizer concentrate in the store. Acid type have a picture of blue hydrangas; the opposite for alkyline. I also remember reading it in a magazine years ago.

26 Jul, 2010


I definetely agree,its the type of soil.

26 Jul, 2010


I've successfully turned a pink one blue using said concentrate. I don't have acidic soil but wanted a blue one! I expect I'll have to keep doing so in future in order to keep it blue!

27 Jul, 2010

How do I say thanks?

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