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Hydrangea macrophylla flowers can change color depending on soil acidity. In acid soils, chemical reactions occur in the soil that make aluminium available to these plants, turning the flowers blue. In alkaline soils, these reactions cannot occur and therefore aluminium is not taken up by the plant.
The flowers on a hydrangea shrub can change from blue to pink or from pink to blue from one season to the next depending on the acidity level of the soil. [32] Adding organic materials such as coffee grounds and citrus peel will increase acidity and turn hydrangea flowers blue. [33]
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 ] There has been one non-chemical example found within Caesalpinioideae , a single sub-family of Fabaceae where the folding of petals cause changes to the color patterns ...
"Orange spots that form on the bottom or the underside of the leaves are hydrangea rust," read Epic Gardening's hydrangea guide. "The top of the leaf will turn yellow and the leaf will eventually die.
A similar hydrangea danger situation occurred in March 2017, when a seemingly miffed C.L. Fornari prepared to cover hydrangea buds with a tarp at her Sandwich home in advance of a cold snap.
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. It is known that acidification of soil can cause change of the hydrangea flower colour from red/pink to blue/violet.
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