Hydrangea (/ha?'dre?nd?i?/;common labels hydrangea or hortensia) is a genus of 70-75 varieties of flowering plant life native to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. Undoubtedly the greatest kinds diversity is in eastern Asia, notably China, Japan, and Korea. The majority are shrubs 1 to 3 meters high, however, many are small trees, yet others lianas reaching up to 30 m (98 feet) by climbing up trees and shrubs. They could be either deciduous or evergreen, although cultivated temperate kinds are all deciduous generally.Having been introduced to the Azores, H. macrophylla is quite typical now, particularly on Faial, which is known as the "blue island" due to the multitude of hydrangeas present on the island.Life cycleHydrangea bouquets are produced from early spring to late fall; they develop in flowerheads (corymbs or panicles) frequently at the ends of the stems.
Usually the flowerheads contain two types of plants: small non-showy bouquets in the center or interior of the flowerhead, and large, showy blooms with large bright colored sepals (tepals). These showy flowers are lengthened in a diamond ring often, or to the exterior of the small flowers. Vegetation in wild populations typically have few to none of them of the showy plants, while cultivated hydrangeas have been bred and picked to have more of the larger type plants.There are two flower arrangements in hydrangeas with Corymb style inflorescens, which include the commonly grown "bigleaf hydrangea"--Hydrangea macrophylla. Mophead bouquets are large spherical flowerheads resembling pom-poms or, as the name means, the comparative head of a mop. On the other hand, lacecap flowers bear round, flat flowerheads with a center core of subdued, small plants bounded by outer bands of bigger bouquets having showy tepals or sepals.
The plants of some rhododendrons and viburnums can seem, at first glance, much like those of some hydrangeas.Garden soil and colors acidityIn most varieties the blooms are white, but in some types (notably H. macrophylla), can be blue, red, green, light purple, or dark crimson. In these species the color is affected by the occurrence of aluminum ions which can be found or tied up depending after the soil pH. For H. h and macrophylla. 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 lead to pink or red flowers.
This is caused by a color change of the rose pigments in the existence of aluminium ions which is often taken up into hyperaccumulating vegetation.[6] Bringing down the pH of potting soils or mixes usually does not change the blossom color to blue, because these soils haven't any aluminum ions. The ability to blue or pink a hydrangea is also affected by the cultivar. Some plants are selected because of their ability to be blued, while some are bred and selected to be red, pink or white. The flower color of all other Hydrangea species is not damaged by aluminum and can't be changed or shifted. Hydrangeas also have a nickname called 'Change Rose'.
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