Trees and Shrubs : Soil
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Hydrangeas turned pink
I've purchased hydrangeas two were blue one pink and one white the following year all plants just turned pink. I was told it is the soil, but if you go down to Clonakilty you will see pink hydrangea beside a blue hydrangea next to a beautiful purple hydrangea growing wild how is this the case. an old man told me to take up one of my hydrangeas which we did and bury old iron chains and horseshoes and this would insure the blue colour we are yet to find out . It has just started to leaf.
evelyn1979, fermoy , Co Cork Posted: 12/03/2017
Hydrangeas are excellent indicators of soil pH.... blue in acid soil, purple in neutral and pink in limy soil. Soil pH can change within the same garden.
Old iron can help to introduce iron to the soil but a better way is to dig in leaf-mould, which is acidic, at planting and to mulch each year with leaf-mould to gradually acidify the soil beneath.
More at: http://www.garden.ie/gardeningskills.aspx?id=542