Hydrangea (/ha?'dre?nd?i?/;common names hydrangea or hortensia) is a genus of 70-75 types of flowering plants indigenous to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. By far the greatest species diversity is eastern Asia, notably China, Japan, and Korea. Most are shrubs 1 to 3 meters high, however, many are small trees and shrubs, while others lianas achieving up to 30 m (98 ft) by climbing up trees. They could be either evergreen or deciduous, although generally cultivated temperate kinds are all deciduous.Having been introduced to the Azores, H. macrophylla is quite typical now, particularly on Faial, which is recognized as the "blue island" due to the multitude of hydrangeas present on the island.Life cycleHydrangea blossoms are produced from planting season to late fall; they grow in flowerheads (corymbs or panicles) frequently at the ends of the stems.
Typically the flowerheads contain two types of bouquets: small non-showy flowers in the center or interior of the flowerhead, and large, showy blossoms with large bright colored sepals (tepals). These showy bouquets tend to be prolonged in a wedding ring, or to the exterior of the tiny flowers. Plant life in outdoors populations typically have few to none of the showy blossoms, while cultivated hydrangeas have been bred and picked to have significantly more of the bigger type blooms.There are two flower arrangements in hydrangeas with Corymb style inflorescens, which includes the commonly grown "bigleaf hydrangea"--Hydrangea macrophylla. Mophead plants are large rounded flowerheads resembling pom-poms or, as the name implies, the brain of your mop. In contrast, lacecap flowers bear round, flat flowerheads with a center core of subdued, small flowers bounded by outer rings of greater blossoms having showy tepals or sepals.
The bouquets of some rhododendrons and viburnums can show up, at first glance, similar to those of some hydrangeas.Colors and dirt acidityIn most kinds the blossoms are white, however in some types (notably H. macrophylla), can be blue, red, red, light purple, or dark purple. In these kinds the colour is damaged by the presence of aluminum ions which are available or tied up depending after the land 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 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 cause pink or red flowers.
This is the effect of a color change of the bloom pigments in the occurrence of aluminium ions that can be adopted into hyperaccumulating plant life.[6] Lowering the pH of potting soils or mixes usually will not change the blossom color to blue, because these soils have no aluminum ions. The capability to blue or pink 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 most other Hydrangea species is not afflicted by aluminum and cannot be changed or shifted. Hydrangeas also have a nickname called 'Change Rose'.
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