Hydrangea (/ha?'dre?nd?i?/;common brands hydrangea or hortensia) is a genus of 70-75 species of flowering crops native to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. Probably the greatest types diversity is within eastern Asia, notably China, Japan, and Korea. Most are shrubs 1 to 3 meters large, however, many are small trees, among others lianas reaching up to 30 m (98 ft) by climbing up trees and shrubs. They could be either evergreen or deciduous, although extensively cultivated temperate species are deciduous.Having been introduced to the Azores, H. macrophylla is currently very common, particularly on Faial, which is recognized as the "blue island" because of the vast number of hydrangeas present on the island.Life cycleHydrangea blossoms are created from planting season to late autumn; they grow in flowerheads (corymbs or panicles) most often at the ends of the stems.
Usually the flowerheads contain two types of bouquets: small non-showy blooms in the guts or interior of the flowerhead, and large, showy bouquets with large colorful sepals (tepals). These showy blossoms are prolonged in a band often, or to the exterior of the small flowers. Plant life in untamed populations have few to none of the showy bouquets typically, while cultivated hydrangeas have been selected and bred to have significantly 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 blossoms are large circular flowerheads resembling pom-poms or, as the name implies, the head 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 viburnums and rhododendrons can appear, at first glance, much like those of some hydrangeas.Colors and earth acidityIn most kinds the bouquets are white, however in some kinds (notably H. macrophylla), can be blue, red, green, light crimson, or dark purple. In these types the color is damaged by the existence of light weight aluminum ions which can be found or tangled up depending after the soil 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 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 caused by a color change of the bloom pigments in the occurrence of aluminium ions which is often taken up into hyperaccumulating vegetation.[6] Reducing the pH of potting soils or mixes usually will not change the blossom color to blue, because these soils haven't any aluminum ions. The ability to blue or green a hydrangea is affected by the cultivar also. Some plants are selected for his or her 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 influenced by aluminum and can't be changed or shifted. Hydrangeas also have a nickname called 'Change Rose'.
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