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. Certainly the greatest kinds diversity is eastern Asia, notably China, Japan, and Korea. Most are shrubs 1 to 3 meters large, however, many are small trees, and others lianas achieving up to 30 m (98 foot) by climbing up trees. They could be either deciduous or evergreen, though the cultivated temperate species are deciduous extensively.Having been introduced to the Azores, H. macrophylla is now very common, particularly on Faial, which is known as the "blue island" because of the vast number of hydrangeas present on the island.Life cycleHydrangea bouquets are produced from early spring to late autumn; they develop in flowerheads (corymbs or panicles) most often at the ends of the stems.
Usually the flowerheads contain two types of plants: small non-showy flowers in the center or interior of the flowerhead, and large, showy bouquets with large bright colored sepals (tepals). These showy blooms are expanded in a engagement ring often, or to the exterior of the tiny flowers. Crops in outdoors populations have few to none of the showy flowers typically, while cultivated hydrangeas have been selected and bred to have significantly more of the larger type blooms.There are two flower arrangements in hydrangeas with Corymb style inflorescens, which include the commonly grown "bigleaf hydrangea"--Hydrangea macrophylla. Mophead bouquets are large round flowerheads resembling pom-poms or, as the name suggests, the head 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 plants of some rhododendrons and viburnums can show up, at first glance, comparable to those of some hydrangeas.Ground and colors acidityIn most types the blooms are white, however in some types (notably H. macrophylla), can be blue, red, green, light crimson, or dark crimson. In these varieties the colour is afflicted by the presence of metal ions which can be found or tied up depending upon 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 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 bring about pink or red flowers.
This is caused by a color change of the blossom pigments in the existence of aluminium ions which is often taken up into hyperaccumulating plant life.[6] Cutting down the pH of potting soils or mixes usually does not change the flower color to blue, because these soils have no aluminum ions. The capability to blue or pink a hydrangea is also influenced by the cultivar. Some plants are selected because of their ability to be blued, while some are bred and selected to be red, white or pink. The flower color of most other Hydrangea species is not damaged by aluminum and can't be changed or shifted. Hydrangeas likewise have a nickname called 'Change Rose'.
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