Hydrangea (/ha?'dre?nd?i?/;common names hydrangea or hortensia) is a genus of 70-75 species of flowering vegetation native to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. Certainly the greatest varieties diversity is within eastern Asia, china notably, Japan, and Korea. Most are shrubs 1 to 3 meters extra tall, however, many are small trees and shrubs, and more lianas reaching up to 30 m (98 feet) by climbing up trees. They can be either evergreen or deciduous, although widely cultivated temperate types are deciduous.Having been introduced to the Azores, H. macrophylla is very common now, on Faial particularly, which is recognized as the "blue island" due to the multitude of hydrangeas present on the island.Life cycleHydrangea flowers are created from early spring to late fall months; they increase in flowerheads (corymbs or panicles) most often at the ends of the stems.
Typically the flowerheads contain two types of blooms: small non-showy plants in the center or interior of the flowerhead, and large, showy plants with large colourful sepals (tepals). These showy blooms are prolonged in a diamond ring often, or to the exterior of the small flowers. Vegetation in crazy populations typically have few to none of the showy blossoms, while cultivated hydrangeas have been decided on and bred to have significantly more of the bigger type flowers.There are two flower arrangements in hydrangeas with Corymb style inflorescens, which includes the commonly grown "bigleaf hydrangea"--Hydrangea macrophylla. Mophead flowers are large rounded flowerheads resembling pom-poms or, as the name signifies, the relative head of the mop. On the other hand, lacecap flowers bear round, flat flowerheads with a center core of subdued, small plants ornamented by outer wedding rings of much larger blossoms having showy tepals or sepals.
The blooms of some viburnums and rhododendrons can appear, initially, much like those of some hydrangeas.Colors and earth acidityIn most species the blooms are white, but in some varieties (notably H. macrophylla), can be blue, red, pink, light purple, or dark crimson. In these species the colour is afflicted by the occurrence of light weight aluminum ions which can be found or tied up depending after the soil 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 caused by a color change of the flower pigments in the presence of aluminium ions which may be taken up into hyperaccumulating vegetation.[6] Bringing down the pH of potting soils or mixes usually will not change the bloom color to blue, because these soils haven't any aluminum ions. The ability to blue or green a hydrangea is inspired 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 affected by aluminum and cannot be changed or shifted. Hydrangeas also have a nickname called 'Change Rose'.
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