Its Just Garden Chemistry
Did you ever wonder why your hydrangea started out pink and then turned into a blue one when you planted it? Well if you were listening to the show on Saturday, you would have found out that it is all to do with chemistry – soil chemistry to be precise.
The color blue is formed when the soil chemistry is enriched with lime it will turn the shrub blue, when enriched with acid (such as Holytone or other fertilizer for hydrangeas etc,) it will turn pink.
Moving a hydrangea can also change the color or the bloom, particularly if it has been moved close to a building where the lime from concrete will be leaching into the soil and then the plant
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