Hydrangea (/ha?'dre?nd?i?/;common titles hydrangea or hortensia) is a genus of 70-75 types of flowering vegetation native to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. Certainly the greatest kinds diversity is eastern Asia, notably China, Japan, and Korea. The majority are shrubs 1 to 3 meters tall, however, many are small trees, while others lianas reaching up to 30 m (98 feet) by climbing up trees and shrubs. They could be either evergreen or deciduous, although cultivated temperate species are deciduous extensively.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 expand 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 blooms with large colorful sepals (tepals). These showy plants are prolonged in a band often, or to the exterior of the small flowers. Vegetation in wild populations typically have few to none of them of the showy blossoms, while cultivated hydrangeas have been chosen 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 blooms are large circular flowerheads resembling pom-poms or, as the name signifies, the comparative brain of any mop. In contrast, lacecap flowers bear round, flat flowerheads with a center core of subdued, small plants encircled by outer bands of bigger plants having showy tepals or sepals.
The flowers of some viburnums and rhododendrons can seem, at first glance, comparable to those of some hydrangeas.Soil and colors acidityIn most kinds the flowers are white, but in some types (notably H. macrophylla), can be blue, red, pink, light purple, or dark crimson. In these types the colour is affected by the occurrence of lightweight aluminum ions which can be found or tied up depending after the land 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 supply aluminum ions and produce flowers that are blue to purple typically, 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 flower pigments in the occurrence of aluminium ions which can be adopted into hyperaccumulating plants.[6] Decreasing the pH of potting soils or mixes usually does not change the bloom color to blue, because these soils have no aluminum ions. The capability to blue or pink a hydrangea is also affected by the cultivar. Some plants are selected because of their ability to be blued, while some are bred and selected to be red, white or pink. The flower color of all other Hydrangea species is not damaged by aluminum and can't be changed or shifted. Hydrangeas also have a nickname called 'Change Rose'.
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