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How much ground coffee can i add to my hydrangea in order to keep it blue


By Sevelyn

United Kingdom Gb

Many thanks for the response. Greatly appreciated. I will buy ericaceous compost very soon.



If its in a pot, go and buy a bag of ericaceous compost and repot into that - coffee grounds have a mildly acidifying effect, but as its in a pot, its far easier to put it in acidic compost.

10 Jul, 2011


You can also buy a little tub of 'Hydrangea colourant' which contains what they need to be blue.

10 Jul, 2011

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