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Ph of used cofffee grinds ?

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  • 20-05-2017 6:25pm
    #1
    mrtom
    Registered Users Posts: 677 ✭✭✭


    I use coffee grinds which I stir & mix in a watering can for a few days before applying to plants. My Research tells me :
    Nutrient content? The kind of coffee grounds a typical homeowner would produce or obtain are around 1.5% Nitrogen. There's also a lot of Magnesium and Potassium, both of which plants really like; but not a lot of phosphorus (the "fruiting and flowering nutrient") or calcium, a mineral that many plants crave, and whose lack helps explain that recalcitrant acidity.So mix those coffee grounds in with some lime or wood ash. We can't recommend their raw use; the acidity could be high enough to damage even acid-loving plants.
    However another source says:
    Brewed coffee grounds have a pH of between 6.5 and 6.8. This is almost neutral. The acidity angle has been misinterpreted for years.
    Which is correct?


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    #2
    papu
    Registered Users Posts: 3,357 ✭✭✭papu


    Get some litmus paper or a pH Meter and test it for yourself.


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