Hydrangea (/ha?'dre?nd?i?/;common brands hydrangea or hortensia) is a genus of 70-75 kinds of flowering plants indigenous to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. Certainly the greatest types diversity is eastern Asia, notably China, Japan, and Korea. The majority are shrubs 1 to 3 meters tall, but some are small trees, as well as others lianas reaching up to 30 m (98 ft) by climbing up trees and shrubs. They can be either deciduous or evergreen, although generally cultivated temperate varieties are deciduous.Having been introduced to the Azores, H. macrophylla is now very common, particularly on Faial, which is known as the "blue island" due to the multitude of hydrangeas present on the island.Life cycleHydrangea flowers 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 flowers: small non-showy plants in the center or interior of the flowerhead, and large, showy blossoms with large vibrant sepals (tepals). These showy flowers are long in a wedding ring often, or to the exterior of the small flowers. Plant life in outrageous populations have few to nothing of the showy flowers typically, while cultivated hydrangeas have been bred and determined to have more of the bigger type bouquets.There are two flower arrangements in hydrangeas with Corymb style inflorescens, which includes the commonly grown "bigleaf hydrangea"--Hydrangea macrophylla. Mophead bouquets are large rounded flowerheads resembling pom-poms or, as the name signifies, the head of the mop. In contrast, lacecap flowers bear round, flat flowerheads with a center core of subdued, small blooms encircled by outer jewelry of larger flowers having showy tepals or sepals.
The blossoms of some viburnums and rhododendrons can appear, at first glance, very much like those of some hydrangeas.Colors and ground acidityIn most species the blooms are white, but in some kinds (notably H. macrophylla), can be blue, red, pink, light purple, or dark purple. In these types the colour is afflicted by the existence of lightweight aluminum ions which are available or tangled up depending after the earth 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 typically produce flowers that are blue to purple, whereas an alkaline soil (pH above 7) will tie up aluminum ions and lead to pink or red flowers.
This is the effect of a color change of the bloom pigments in the occurrence of aluminium ions which can be taken up into hyperaccumulating plant life.[6] Reducing the pH of potting soils or mixes usually does not change the bloom color to blue, because these soils haven't any aluminum ions. The ability to blue or green a hydrangea is also influenced by the cultivar. 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 also have a nickname called 'Change Rose'.
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