Hydrangea (/ha?'dre?nd?i?/;common brands hydrangea or hortensia) is a genus of 70-75 types of flowering vegetation native to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. Probably the greatest types diversity is at eastern Asia, notably China, Japan, and Korea. Most are shrubs 1 to 3 meters large, however, many are small trees, yet others lianas getting up to 30 m (98 feet) by climbing up trees. They can be either evergreen or deciduous, although extensively cultivated temperate varieties are all deciduous.Having been introduced to the Azores, H. macrophylla is currently very common, particularly on Faial, which is recognized as the "blue island" because of the vast number of hydrangeas present on the island.Life cycleHydrangea blossoms are produced from planting season to late fall months; they expand in flowerheads (corymbs or panicles) frequently at the ends of the stems.
Usually 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 blooms are often expanded in a band, or to the exterior of the tiny flowers. Plant life in outdoors populations have few to none of them of the showy blooms 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 bouquets are large spherical flowerheads resembling pom-poms or, as the name suggests, the comparative mind of the mop. In contrast, lacecap flowers bear round, flat flowerheads with a center core of subdued, small blooms surrounded by outer bands of much larger blossoms having showy tepals or sepals.
The flowers of some viburnums and rhododendrons can look, at first glance, a lot like those of some hydrangeas.Garden soil and colors acidityIn most varieties the blossoms are white, however in some species (notably H. macrophylla), can be blue, red, red, light crimson, or dark crimson. In these varieties the color is damaged by the existence of light weight aluminum ions which are available or tangled up depending upon the dirt 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 cause pink or red flowers.
This is the effect of a color change of the flower pigments in the occurrence of aluminium ions which may be taken up into hyperaccumulating crops.[6] Minimizing the pH of potting soils or mixes usually does not change the bloom color to blue, because these soils have no aluminum ions. The capability to blue or pink a hydrangea is influenced 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, pink or white. The flower color of most other Hydrangea species is not damaged by aluminum and cannot be changed or shifted. Hydrangeas likewise have a nickname called 'Change Rose'.
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