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She provided this pH scale for hydrangea colors: Bright blue: 4.5 Muted blue: 5 Violet blue: 5.5 Purple/blue and pink: 6-6.5 Pink: 7.0 or higher.
Hydrangea flower color changes based on the pH in soil. As the graph depicts, soil with a pH of 5.5 or lower will produce blue flowers, a pH of 6.5 or higher will produce pink hydrangeas, and soil in between 5.5 and 6.5 will have purple hydrangeas. Hydrangea flower color can change based on the pH in soil.
Know your hydrangeas as to their color. In reality this is also like knowing your soil pH and how it varies across the landscape, how it colors. Find a harmony of colors with these hydrangeas
Those pigments show blue colour only in aqueous solution and are less stable than metalloanthocyanins. [2] Example of this kind of pigment is present in hydrangea sepals. Main anthocyanin here is delphinidin-3-glucoside what should result in the blue flower formation, but cultivars with red and pink flowers are also present.
Hydrangea serrata 'Tiny Tuff Stuff' USDA Hardiness zones: 5 to 9 Size: 18 to 24 inches tall and wide Mountain hydrangeas like this one have beautiful lacecap flowers which range from blue to pink ...
Floral color change can also be a result of an increase or decrease in pH. Hydrangea is a model genus for this particular chemical change in flowers. Floral pigments in Hydrangea are affected by the presence of aluminum ions in the soil, causing changes in flower color from red, pink, blue, light purple or dark purple. [4]