Hydrangea (/ha?'dre?nd?i?/;common names hydrangea or hortensia) is a genus of 70-75 kinds of flowering plant life native to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. Definitely the greatest varieties diversity is within eastern Asia, china notably, Japan, and Korea. Most are shrubs 1 to 3 meters tall, however, many are small trees and shrubs, and others lianas getting up to 30 m (98 feet) by climbing up trees and shrubs. They could be either deciduous or evergreen, though the cultivated temperate types are all deciduous extensively.Having been introduced to the Azores, H. macrophylla is very common now, particularly on Faial, which is known as the "blue island" because of the multitude of hydrangeas present on the island.Life cycleHydrangea blossoms are created from early spring to late fall months; they expand in flowerheads (corymbs or panicles) most often at the ends of the stems.
Typically the flowerheads contain two types of blooms: small non-showy blooms in the center or interior of the flowerhead, and large, showy bouquets with large vibrant sepals (tepals). These showy flowers are lengthened in a ring often, or to the surface of the tiny flowers. Crops in outdoors populations typically have few to none of them of the showy blossoms, while cultivated hydrangeas have been preferred and bred to have more of the larger type flowers.There are two flower arrangements in hydrangeas with Corymb style inflorescens, which includes the commonly grown "bigleaf hydrangea"--Hydrangea macrophylla. Mophead blooms are large rounded flowerheads resembling pom-poms or, as the name indicates, the brain of any 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 flowers of some rhododendrons and viburnums can seem, initially, very much like those of some hydrangeas.Colors and earth acidityIn most species the blossoms are white, however in some varieties (notably H. macrophylla), can be blue, red, green, light purple, or dark purple. In these kinds the colour is affected by the existence of aluminium ions which are available or tied up depending upon the land pH. For H. h and macrophylla. serrata cultivars, the flower color can be dependant on 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 cause pink or red flowers.
This is the effect of a color change of the blossom pigments in the occurrence of aluminium ions that can be adopted into hyperaccumulating plant life.[6] Bringing down 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 pink a hydrangea is affected by the cultivar also. Some plants are selected for 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 influenced by aluminum and cannot be changed or shifted. Hydrangeas likewise have a nickname called 'Change Rose'.
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