Hydrangea (/ha?'dre?nd?i?/;common names hydrangea or hortensia) is a genus of 70-75 species of flowering plant life native to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. By far the greatest varieties diversity is in eastern Asia, china notably, Japan, and Korea. Most are shrubs 1 to 3 meters high, but some are small trees and shrubs, and more lianas getting up to 30 m (98 ft) 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 currently very common, on Faial particularly, which is recognized as the "blue island" due to the vast number of hydrangeas present on the island.Life cycleHydrangea plants are created from early spring to late fall; they expand in flowerheads (corymbs or panicles) frequently at the ends of the stems.
Usually the flowerheads contain two types of bouquets: small non-showy plants in the center or interior of the flowerhead, and large, showy bouquets with large colorful sepals (tepals). These showy flowers are often lengthened in a diamond ring, or to the surface of the tiny flowers. Vegetation in outdoors populations have few to nothing of the showy flowers typically, while cultivated hydrangeas have been preferred and bred to have more of the larger type blooms.There are two flower arrangements in hydrangeas with Corymb style inflorescens, which include the commonly grown "bigleaf hydrangea"--Hydrangea macrophylla. Mophead blossoms are large spherical flowerheads resembling pom-poms or, as the name signifies, the relative mind of a 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 blooms of some viburnums and rhododendrons can seem, initially, similar to those of some hydrangeas.Soil and colors acidityIn most species the plants are white, but in some species (notably H. macrophylla), can be blue, red, green, light purple, or dark purple. In these varieties the colour is damaged by the existence of aluminium ions which are available or tied up depending after the garden soil 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 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 rose pigments in the presence of aluminium ions that can be taken up into hyperaccumulating vegetation.[6] Reducing the pH of potting soils or mixes usually does not change the rose color to blue, because these soils haven't any aluminum ions. The ability to blue or green a hydrangea is also affected by the cultivar. Some plants are selected because of their ability to be blued, while others are bred and selected to be red, pink or white. The flower color of most other Hydrangea species is not affected by aluminum and can't be changed or shifted. Hydrangeas also have a nickname called 'Change Rose'.
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