Hydrangea (/ha?'dre?nd?i?/;common names hydrangea or hortensia) is a genus of 70-75 species of flowering plants indigenous to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. Probably the greatest types diversity is eastern Asia, notably China, Japan, and Korea. Most are shrubs 1 to 3 meters large, but some are small trees, and others lianas reaching up to 30 m (98 feet) by climbing up trees and shrubs. They can be either evergreen or deciduous, though the broadly cultivated temperate species are deciduous.Having been introduced to the Azores, H. macrophylla is very common now, particularly on Faial, which is known as the "blue island" because of the multitude of hydrangeas present on the island.Life cycleHydrangea blooms are produced from early spring to late autumn; they increase in flowerheads (corymbs or panicles) most often at the ends of the stems.
Typically the flowerheads contain two types of blossoms: small non-showy blooms in the guts or interior of the flowerhead, and large, showy bouquets with large multi-colored sepals (tepals). These showy blossoms tend to be prolonged in a diamond ring, or to the exterior of the tiny flowers. Plants in wild populations have few to nothing of the showy flowers typically, while cultivated hydrangeas have been bred and preferred to have significantly more of the larger type blossoms.There are two flower arrangements in hydrangeas with Corymb style inflorescens, which include the commonly grown "bigleaf hydrangea"--Hydrangea macrophylla. Mophead blooms are large spherical flowerheads resembling pom-poms or, as the name means, the brain of a mop. In contrast, lacecap flowers bear round, flat flowerheads with a center core of subdued, small plants surrounded by outer rings of bigger blooms having showy tepals or sepals.
The flowers of some viburnums and rhododendrons can seem, at first glance, a lot like those of some hydrangeas.Earth and colors acidityIn most kinds the flowers are white, but in some species (notably H. macrophylla), can be blue, red, pink, light crimson, or dark crimson. In these kinds the color is affected by the presence of aluminum ions which are available or tangled up depending upon the dirt 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 supply aluminum ions and produce flowers that are blue to purple typically, 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 blossom pigments in the existence of aluminium ions which may be adopted into hyperaccumulating vegetation.[6] Cutting down the pH of potting soils or mixes usually will not change the bloom color to blue, because these soils have no aluminum ions. The capability to blue or pink a hydrangea is also affected by the cultivar. Some plants are selected for their ability to be blued, while some are bred and selected to be red, white or pink. The flower color of all other Hydrangea species is not influenced by aluminum and cannot be changed or shifted. Hydrangeas also have a nickname called 'Change Rose'.
Echinacea purpurea ‘White Swan’ pbmGarden
Hydrangea arborescens Flower 27/07/2013, Kew Gardens, London
Sweet Carol Bliss Hydrangea © 2013 Patty Hankins
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