Hydrangea (/ha?'dre?nd?i?/;common brands hydrangea or hortensia) is a genus of 70-75 varieties of flowering vegetation local to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. By far the greatest kinds diversity is within eastern Asia, china notably, Japan, and Korea. Most are shrubs 1 to 3 meters large, but some are small trees and shrubs, and others lianas achieving up to 30 m (98 ft) by climbing up trees and shrubs. They could be either evergreen or deciduous, although cultivated temperate varieties are all deciduous generally.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 vast number of hydrangeas present on the island.Life cycleHydrangea flowers are created from planting season to late fall months; they increase in flowerheads (corymbs or panicles) frequently at the ends of the stems.
Typically the flowerheads contain two types of plants: small non-showy flowers in the center or interior of the flowerhead, and large, showy plants with large colourful sepals (tepals). These showy blossoms are prolonged in a ring often, or to the exterior of the tiny flowers. Plant life in untamed populations have few to none of them of the showy plants typically, while cultivated hydrangeas have been selected and bred to have significantly 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 flowers are large round flowerheads resembling pom-poms or, as the name indicates, the mind 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 bouquets of some rhododendrons and viburnums can appear, initially, similar to those of some hydrangeas.Colors and land acidityIn most species the flowers are white, but in some kinds (notably H. macrophylla), can be blue, red, pink, light crimson, or dark purple. In these species the color is affected by the occurrence of metal ions which can be found or tied up depending upon the earth pH. For H. macrophylla and H. 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 bring about pink or red flowers.
This is caused by a color change of the flower pigments in the presence of aluminium ions which can be adopted into hyperaccumulating vegetation.[6] Minimizing 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 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, pink or white. The flower color of all other Hydrangea species is not affected by aluminum and can't be changed or shifted. Hydrangeas likewise have a nickname called 'Change Rose'.
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