Hydrangea (/ha?'dre?nd?i?/;common names hydrangea or hortensia) is a genus of 70-75 varieties of flowering crops 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. Most are shrubs 1 to 3 meters extra tall, however, many are small trees, and others lianas attaining up to 30 m (98 foot) by climbing up trees and shrubs. They could be either deciduous or evergreen, though the cultivated temperate kinds are deciduous broadly.Having been introduced to the Azores, H. macrophylla is quite typical now, particularly on Faial, which is known as the "blue island" due to the vast number of hydrangeas present on the island.Life cycleHydrangea bouquets are produced from early spring to late fall; they increase in flowerheads (corymbs or panicles) most often at the ends of the stems.
Usually the flowerheads contain two types of blossoms: small non-showy flowers in the center or interior of the flowerhead, and large, showy blossoms with large multi-colored sepals (tepals). These showy blooms are often prolonged in a band, or to the surface of the small flowers. Vegetation in wild populations have few to none of them of the showy blooms typically, while cultivated hydrangeas have been selected and bred 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 bouquets are large round flowerheads resembling pom-poms or, as the name indicates, the mind 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 plants of some viburnums and rhododendrons can seem, at first glance, just like those of some hydrangeas.Land and colors acidityIn most varieties the flowers are white, however in some varieties (notably H. macrophylla), can be blue, red, pink, light crimson, or dark purple. In these species the color is influenced by the presence of aluminium ions which can be found or tied up depending upon the dirt pH. For H. macrophylla and H. serrata cultivars, the flower color can be determined by the relative acidity of the soil: an acidic soil (pH below 7), will have available aluminum ions and typically produce flowers that are blue to purple, whereas an alkaline soil (pH above 7) will tie up aluminum ions and result in 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 crops.[6] Cutting down 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 influenced by the cultivar. Some plants are selected for 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 damaged by aluminum and cannot be changed or shifted. Hydrangeas also have a nickname called 'Change Rose'.
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