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Hi all I have two hydrangeas in pots I bought them the colour blue now they are pink , I realise that I have to change the p h balance of the soil , and I was told that coffee waste can do this for me but how much to add to the soil I don't know is there anyone who could advise me on this thank you


  • steephillsteephill Posts: 2,836

    Better to use a product designed to do this, look for hydrangea colourant in garden centres. It is usually made up of ferrous sulphate and perhaps aluminium sulphate. Use as directed and don't overdo it or you will inhibit takeup of other nutrients from the soil.

  • DovefromaboveDovefromabove Posts: 87,876

    I've used the hydrangea colourant on the big hydrangea I have in a tub for years - works well and is sraightforward. image

    Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.

  • Thank you all for responding to my question I will go and buy some aluminium sulphate or hydrangea colourant . kind regards to all 

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