Hydrangea (/ha?'dre?nd?i?/;common names hydrangea or hortensia) is a genus of 70-75 kinds of flowering vegetation indigenous to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. Definitely the greatest types diversity is at eastern Asia, notably China, Japan, and Korea. Most are shrubs 1 to 3 meters high, however, many are small trees and shrubs, and more lianas getting up to 30 m (98 ft) by climbing up trees and shrubs. They can be either deciduous or evergreen, though the widely cultivated temperate kinds are deciduous.Having been introduced to the Azores, H. macrophylla is very common now, particularly on Faial, which is recognized as the "blue island" because of the vast number of hydrangeas present on the island.Life cycleHydrangea flowers are produced from early spring to late fall months; they grow in flowerheads (corymbs or panicles) most often at the ends of the stems.
Typically the flowerheads contain two types of blossoms: small non-showy plants in the guts or interior of the flowerhead, and large, showy plants with large multi-colored sepals (tepals). These showy bouquets are often prolonged in a engagement ring, or to the surface of the tiny flowers. Plants in untamed populations have few to nothing of the showy plants typically, while cultivated hydrangeas have been bred and determined to have 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 blossoms are large spherical flowerheads resembling pom-poms or, as the name implies, the head of a mop. On the other hand, lacecap flowers bear round, flat flowerheads with a center core of subdued, small blossoms bounded by outer jewelry of bigger blossoms having showy tepals or sepals.
The plants of some rhododendrons and viburnums can seem, at first glance, much like those of some hydrangeas.Colors and soil acidityIn most varieties the bouquets are white, but in some species (notably H. macrophylla), can be blue, red, red, light purple, or dark purple. In these varieties the color is afflicted by the presence of light weight aluminum ions which are available or tangled up depending after the land 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 have available 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 the effect of a color change of the rose pigments in the existence of aluminium ions which can be taken up into hyperaccumulating plants.[6] Reducing the pH of potting soils or mixes usually will not change the rose color to blue, because these soils have no aluminum ions. The ability to blue or green 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, pink or white. The flower color of most other Hydrangea species is not influenced by aluminum and cannot be changed or shifted. Hydrangeas also have a nickname called 'Change Rose'.
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