Blue Hydrangea Blossom
Photograph - Photography
"Blue Hydrangea Blossom" by Catherine Sherman.
Raindrops cling to the blue petals of a hydrangea flower. Hydrangea (or hortensia) is a genus of 70–75 species of flowering plants native to Asia and the Americas.
Hydrangea flowers are produced from early spring to late autumn; they grow in flowerheads (corymbs or panicles) most often at the ends of the stems. Typically the flowerheads contain two types of flowers: small non-showy flowers in the center or interior of the flowerhead, and large, showy flowers with large colorful sepals (tepals). These showy flowers are often extended in a ring, or to the exterior of the small flowers. Plants in wild populations typically have few to none of the showy flowers, while cultivated hydrangeas have been bred and selected to have more of the larger type flowers.
For Hydrangea 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 flowers that are blue to purple, while an alkaline soil (pH above 7) will tie up aluminum ions and result in pink or red flowers.
November 6th, 2019
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