Hydrangea (/ha?'dre?nd?i?/;common brands hydrangea or hortensia) is a genus of 70-75 kinds of flowering crops indigenous to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. By far the greatest kinds diversity is within eastern Asia, notably China, Japan, and Korea. Most are shrubs 1 to 3 meters high, but some are small trees and shrubs, yet others lianas reaching up to 30 m (98 feet) by climbing up trees and shrubs. They could be either deciduous or evergreen, although extensively cultivated temperate kinds are deciduous.Having been introduced to the Azores, H. macrophylla is quite typical now, on Faial particularly, which is recognized as the "blue island" because of the multitude of hydrangeas present on the island.Life cycleHydrangea blooms are created from planting season to late autumn; 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 center or interior of the flowerhead, and large, showy blooms with large bright colored sepals (tepals). These showy blossoms are often lengthened in a engagement ring, or to the surface of the tiny flowers. Crops in outrageous populations routinely have few to none of them of the showy bouquets, while cultivated hydrangeas have been decided on and bred to have more of the bigger type flowers.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 signifies, the brain of any mop. On the other hand, lacecap flowers bear round, flat flowerheads with a center core of subdued, small blooms surrounded by outer wedding rings of much larger flowers having showy tepals or sepals.
The blossoms of some viburnums and rhododendrons can look, initially, very much like those of some hydrangeas.Land and colors acidityIn most varieties the flowers are white, however in some types (notably H. macrophylla), can be blue, red, green, light crimson, or dark purple. In these types the color is affected by the occurrence of light weight aluminum ions which are available or tied up depending upon the earth 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 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 blossom pigments in the presence of aluminium ions which can be taken up 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 ability to blue or pink a hydrangea is also influenced by the cultivar. Some plants are selected for their ability to be blued, while others are bred and selected to be red, pink or white. The flower color of all other Hydrangea species is not affected by aluminum and can't be changed or shifted. Hydrangeas also have a nickname called 'Change Rose'.
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