Each of these hydrangea bushes
produced a sublime variety of shades
despite being adjacent to each other at Plas Newydd on Angelsey.
I had always understood that the colour was dependent on the Ph of the soil,
with blues being produced by acidic soil,
pink and purple by alkaline
and cream by neutral.
But I think something more complicated is going on here
and it has to do with the presence of aluminium ions
which can change the colour of the flower pigments.
I couldn't get enough of them.