Hydrangea (/ha?'dre?nd?i?/;common brands hydrangea or hortensia) is a genus of 70-75 kinds of flowering crops local to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. By far the greatest types diversity is at eastern Asia, china notably, Japan, and Korea. Most are shrubs 1 to 3 meters large, but some are small trees, yet others lianas reaching up to 30 m (98 foot) by climbing up trees and shrubs. They can be either evergreen or deciduous, though the widely cultivated temperate species 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" due to the multitude of hydrangeas present on the island.Life cycleHydrangea blooms are created from early spring to late autumn; they expand in flowerheads (corymbs or panicles) frequently at the ends of the stems.
Typically the flowerheads contain two types of plants: small non-showy bouquets in the guts or interior of the flowerhead, and large, showy bouquets with large bright colored sepals (tepals). These showy blossoms tend to be prolonged in a ring, or to the surface of the small flowers. Vegetation in wild populations typically have few to nothing of the showy flowers, while cultivated hydrangeas have been bred and chosen to have significantly more of the larger type flowers.There are two flower arrangements in hydrangeas with Corymb style inflorescens, which include the commonly grown "bigleaf hydrangea"--Hydrangea macrophylla. Mophead blossoms are large round flowerheads resembling pom-poms or, as the name signifies, the brain of your mop. On the other hand, lacecap flowers bear round, flat flowerheads with a center core of subdued, small plants surrounded by outer rings of much larger bouquets having showy tepals or sepals.
The bouquets of some rhododendrons and viburnums can appear, at first glance, just like those of some hydrangeas.Colors and ground acidityIn most types the flowers are white, however in some types (notably H. macrophylla), can be blue, red, red, light purple, or dark crimson. In these kinds the color is affected by the presence of lightweight aluminum ions which can be found or tangled 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 typically produce flowers that are blue to purple, 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 bloom pigments in the occurrence of aluminium ions which is often adopted into hyperaccumulating crops.[6] Reducing the pH of potting soils or mixes usually will not change the blossom color to blue, because these soils have no aluminum ions. The ability to blue or green a hydrangea is inspired by the cultivar also. Some plants are selected for their 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 influenced by aluminum and can't be changed or shifted. Hydrangeas also have a nickname called 'Change Rose'.
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