"In some species (notably H. macrophylla), [flower color] can be blue, red, pink, light purple, or dark purple. In these species the color is affected by the presence of aluminum ions which are available or tied up depending upon thesoil pH. For H. macrophylla and H. serrata cultivars, the flower color can be determined by the relative acidity of the soil: an acidic soil (pH below 7), will have available aluminum ions and typically produce flower color that are blue to purple, whereas an alkaline soil (pH above 7) will tie up aluminum ions and result in pink or red flowers. This is caused by a color change of the flower pigments in the presence of aluminium ions which can be taken up into hyperaccumulating plants. Lowering the pH of potting soils or mixes typically do not change the flower color to blue because these soils have no aluminum ions. The ability to blue or pink a hydrangea is also influenced by the cultivar." Wikipedia
Wednesday, June 29, 2016
Flower for the Day Hydrangea 6-29-16
This is the year of the hydrangea. I have two substantial hydrangea bushes. This one has not bloomed for two years but this year better than ever and in multiple colors.
This shows some early blooms.
And later on all these colors appeared - all on the same bush. I do not add anything to the soil.