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hydrangeas

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

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  • steephillsteephill Posts: 1,506

    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 Central Norfolk UKPosts: 65,450

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

    “I am not lost, for I know where I am. But however, where I am may be lost.” Winnie the Pooh







  • 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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