Hydrangea (/ha?'dre?nd?i?/;common names hydrangea or hortensia) is a genus of 70-75 species of flowering plants native to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. Probably the greatest kinds diversity is eastern Asia, notably China, Japan, and Korea. Most are shrubs 1 to 3 meters high, however, many are small trees and shrubs, as well as others lianas attaining up to 30 m (98 foot) by climbing up trees. They could be either evergreen or deciduous, though the cultivated temperate species are all deciduous broadly.Having been introduced to the Azores, H. macrophylla is quite typical now, on Faial particularly, which is recognized as the "blue island" due to the multitude of hydrangeas present on the island.Life cycleHydrangea bouquets are created from planting season to late autumn; they expand in flowerheads (corymbs or panicles) most often at the ends of the stems.
Usually the flowerheads contain two types of blossoms: small non-showy bouquets in the guts or interior of the flowerhead, and large, showy bouquets with large multi-colored sepals (tepals). These showy bouquets are often expanded in a diamond ring, or to the surface of the small flowers. Plants in untamed populations routinely have few to none of them of the showy blossoms, while cultivated hydrangeas have been preferred and bred to have 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 blooms are large rounded flowerheads resembling pom-poms or, as the name signifies, the relative mind of the mop. On the other hand, lacecap flowers bear round, flat flowerheads with a center core of subdued, small blossoms surrounded by outer bands of larger blooms having showy tepals or sepals.
The blossoms of some rhododendrons and viburnums can appear, initially, just like those of some hydrangeas.Colors and ground acidityIn most types the bouquets are white, but in some species (notably H. macrophylla), can be blue, red, red, light purple, or dark crimson. In these kinds the colour is influenced by the presence of lightweight aluminum ions which are available or tangled up depending upon the dirt 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 result in pink or red flowers.
This is the effect of a color change of the bloom pigments in the occurrence of aluminium ions which is often taken up into hyperaccumulating crops.[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 also influenced by the cultivar. Some plants are selected because of 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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