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Vitax Hydrangea Colourant
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Hydrangeas growing in the presence of iron or aluminium salts will tend to change colour and produce blue flowers.  Varieties which are naturally pale pink tend to blue best, the darker pink varieties turning to mauve/blue.  Best results are obtained with plants growing in acid soil, though this product will work well with alkaline soil provided the dose is doubled.  Please follow manufacturer's directions for use.

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