Hydrangea (/ha?'dre?nd?i?/;common names hydrangea or hortensia) is a genus of 70-75 kinds of flowering plants native to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. Probably the greatest varieties diversity is at eastern Asia, china notably, Japan, and Korea. The majority are shrubs 1 to 3 meters tall, but some are small trees and shrubs, as well as others lianas attaining up to 30 m (98 ft) by climbing up trees and shrubs. They can be either evergreen or deciduous, although widely cultivated temperate species are all deciduous.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 vast number of hydrangeas present on the island.Life cycleHydrangea bouquets are produced from early spring to late fall months; they grow in flowerheads (corymbs or panicles) frequently at the ends of the stems.
Usually the flowerheads contain two types of plants: small non-showy plants in the center or interior of the flowerhead, and large, showy flowers with large bright colored sepals (tepals). These showy bouquets are prolonged in a band often, or to the surface of the tiny flowers. Vegetation in untamed populations typically have few to none of the showy blossoms, while cultivated hydrangeas have been chosen and bred to have significantly 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 blossoms are large spherical flowerheads resembling pom-poms or, as the name indicates, the mind of your 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 bouquets of some viburnums and rhododendrons can show up, initially, comparable to those of some hydrangeas.Dirt and colors acidityIn most kinds the blooms are white, however in some types (notably H. macrophylla), can be blue, red, green, light crimson, or dark crimson. In these kinds the color is afflicted by the existence of aluminum ions which can be found or tangled up depending after the land pH. For H. macrophylla and H. 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 typically produce flowers that are blue to purple, whereas an alkaline soil (pH above 7) will tie up aluminum ions and bring about pink or red flowers.
This is the effect of a color change of the flower pigments in the presence of aluminium ions which is often taken up into hyperaccumulating plant life.[6] Lowering the pH of potting soils or mixes usually does not change the blossom color to blue, because these soils haven't any aluminum ions. The capability to blue or pink a hydrangea is influenced by the cultivar also. Some plants are selected because of 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 likewise have a nickname called 'Change Rose'.
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