Hydrangea (/ha?'dre?nd?i?/;common brands hydrangea or hortensia) is a genus of 70-75 kinds of flowering vegetation native to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. Definitely the greatest species diversity is eastern Asia, china notably, Japan, and Korea. Most are shrubs 1 to 3 meters high, but some are small trees, yet others lianas reaching up to 30 m (98 feet) by climbing up trees and shrubs. They could be either deciduous or evergreen, though the greatly cultivated temperate species are all deciduous.Having been introduced to the Azores, H. macrophylla is very common now, on Faial particularly, which is known as the "blue island" due to the multitude of hydrangeas present on the island.Life cycleHydrangea blooms are created from planting season to late fall; they grow in flowerheads (corymbs or panicles) most often at the ends of the stems.
Usually the flowerheads contain two types of blooms: small non-showy flowers in the center or interior of the flowerhead, and large, showy plants with large colourful sepals (tepals). These showy blossoms are often prolonged in a wedding ring, or to the surface of the tiny flowers. Vegetation in crazy populations have few to nothing of the showy blooms typically, while cultivated hydrangeas have been determined and bred to have more of the larger type flowers.There are two flower arrangements in hydrangeas with Corymb style inflorescens, which include the commonly grown "bigleaf hydrangea"--Hydrangea macrophylla. Mophead flowers are large round flowerheads resembling pom-poms or, as the name means, the relative head of your 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 blossoms of some rhododendrons and viburnums can look, at first glance, similar to those of some hydrangeas.Colors and land acidityIn most varieties the flowers are white, however in some kinds (notably H. macrophylla), can be blue, red, green, light purple, or dark purple. In these species the color is afflicted by the occurrence of metal ions which can be found or tied up depending after the ground 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 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 rose pigments in the existence of aluminium ions which is often taken up into hyperaccumulating plants.[6] Decreasing 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 capability 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, pink or white. The flower color of all other Hydrangea species is not afflicted by aluminum and can't be changed or shifted. Hydrangeas also have a nickname called 'Change Rose'.
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