Hydrangea Colourant changes pink hydrangeas to blue and dark pink flowers to mauve, working best on acid soils. It also enhances the colour of all lime-hating shrubs. If your soil is alkaline, ericaceous compost should be added plus a double dose of colourant. It is suitable for hydrangeas in pots as well as in the border. Mix the colourant with the soil when planting or dissolve in water and apply.

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United Kingdom (England, Wales, Mainland Scotland, Northern Ireland)

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