Hydrangea (/ha?'dre?nd?i?/;common brands hydrangea or hortensia) is a genus of 70-75 kinds of flowering crops native to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. Certainly the greatest varieties diversity is within eastern Asia, notably China, Japan, and Korea. The majority are shrubs 1 to 3 meters tall, however, many are small trees and shrubs, among others lianas achieving up to 30 m (98 foot) by climbing up trees. They can be either evergreen or deciduous, although cultivated temperate species are all deciduous greatly.Having been introduced to the Azores, H. macrophylla is quite typical now, on Faial particularly, which is known as the "blue island" because of the multitude of hydrangeas present on the island.Life cycleHydrangea flowers are produced from early spring to late autumn; they increase in flowerheads (corymbs or panicles) frequently at the ends of the stems.
Typically the flowerheads contain two types of blossoms: small non-showy blossoms in the guts or interior of the flowerhead, and large, showy blossoms with large multi-colored sepals (tepals). These showy plants are lengthened in a wedding ring often, or to the exterior of the tiny flowers. Crops in outdoors populations typically have few to none of the showy bouquets, while cultivated hydrangeas have been chosen and bred to have more of the larger type bouquets.There are two flower arrangements in hydrangeas with Corymb style inflorescens, which includes the commonly grown "bigleaf hydrangea"--Hydrangea macrophylla. Mophead blossoms are large rounded flowerheads resembling pom-poms or, as the name means, the comparative mind of a mop. In contrast, lacecap flowers bear round, flat flowerheads with a center core of subdued, small flowers surrounded by outer rings of larger flowers having showy sepals or tepals.
The bouquets of some viburnums and rhododendrons can show up, at first glance, very much like those of some hydrangeas.Soil and colors acidityIn most varieties the blossoms are white, but in some varieties (notably H. macrophylla), can be blue, red, pink, light purple, or dark crimson. In these species the colour is affected by the presence of metal ions which are available or tied up depending after the ground 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 have available aluminum ions and typically produce flowers that are blue to purple, 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 occurrence of aluminium ions which can be adopted into hyperaccumulating plant life.[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 capability to blue or green a hydrangea is inspired by the cultivar also. Some plants are selected for his or her 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 afflicted by aluminum and cannot be changed or shifted. Hydrangeas likewise have a nickname called 'Change Rose'.
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