Hydrangea (/ha?'dre?nd?i?/;common names hydrangea or hortensia) is a genus of 70-75 varieties of flowering plants local to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. Probably the greatest kinds diversity is within eastern Asia, china notably, Japan, and Korea. Most are shrubs 1 to 3 meters extra tall, but some are small trees and shrubs, while others lianas reaching up to 30 m (98 foot) by climbing up trees. They can be either deciduous or evergreen, although cultivated temperate varieties are all deciduous widely.Having been introduced to the Azores, H. macrophylla is quite typical now, particularly on Faial, which is recognized as the "blue island" due to the vast number of hydrangeas present on the island.Life cycleHydrangea blooms are produced from early spring to late fall; 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 blossoms in the center or interior of the flowerhead, and large, showy plants with large multi-colored sepals (tepals). These showy plants are often expanded in a ring, or to the surface of the small flowers. Crops in crazy populations routinely have few to none of them of the showy blossoms, while cultivated hydrangeas have been bred and preferred to have significantly more of the bigger type blossoms.There are two flower arrangements in hydrangeas with Corymb style inflorescens, which include the commonly grown "bigleaf hydrangea"--Hydrangea macrophylla. Mophead blooms are large spherical flowerheads resembling pom-poms or, as the name suggests, the brain of a mop. In contrast, lacecap flowers bear round, flat flowerheads with a center core of subdued, small blossoms surrounded by outer jewelry of bigger flowers having showy tepals or sepals.
The bouquets of some viburnums and rhododendrons can show up, initially, similar to those of some hydrangeas.Colors and ground acidityIn most types the plants are white, however in some kinds (notably H. macrophylla), can be blue, red, pink, light purple, or dark purple. In these kinds the colour is influenced by the occurrence of lightweight aluminum ions which can be found or tangled up depending after the soil 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 caused by a color change of the bloom pigments in the existence of aluminium ions which can be taken up into hyperaccumulating plants.[6] Minimizing the pH of potting soils or mixes usually will not change the rose color to blue, because these soils haven't any aluminum ions. The capability to blue or pink a hydrangea is also affected by the cultivar. 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 all other Hydrangea species is not affected by aluminum and cannot be changed or shifted. Hydrangeas also have a nickname called 'Change Rose'.
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