Hydrangea (/ha?'dre?nd?i?/;common names hydrangea or hortensia) is a genus of 70-75 kinds of flowering crops indigenous to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. Undoubtedly the greatest varieties diversity is within 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 achieving up to 30 m (98 feet) by climbing up trees and shrubs. They could be either deciduous or evergreen, though the broadly cultivated temperate types are all deciduous.Having been introduced to the Azores, H. macrophylla is now very common, on Faial particularly, which is known as the "blue island" due to the multitude of hydrangeas present on the island.Life cycleHydrangea blooms are produced from planting season to late fall months; they grow in flowerheads (corymbs or panicles) frequently at the ends of the stems.
Typically the flowerheads contain two types of blooms: small non-showy blossoms in the center or interior of the flowerhead, and large, showy flowers with large bright colored sepals (tepals). These showy blooms are often long in a ring, or to the exterior of the tiny flowers. Crops in crazy populations typically have few to nothing of the showy blossoms, while cultivated hydrangeas have been selected and bred to have significantly more of the larger type blooms.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 the mop. On the other hand, 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 rhododendrons and viburnums can seem, at first glance, very much like those of some hydrangeas.Colors and earth acidityIn most varieties the plants are white, however in some species (notably H. macrophylla), can be blue, red, pink, light purple, or dark purple. In these types the colour is affected by the occurrence of light weight aluminum ions which can be found or tied up depending after 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 lead to pink or red flowers.
This is the effect of a color change of the blossom pigments in the presence of aluminium ions which may be taken up into hyperaccumulating plant life.[6] Bringing down the pH of potting soils or mixes usually will not change the rose color to blue, because these soils have no aluminum ions. The capability to blue or pink a hydrangea is influenced by the cultivar also. Some plants are selected for his or her ability to be blued, while others are bred and selected to be red, pink or white. The flower color of all other Hydrangea species is not afflicted by aluminum and cannot be changed or shifted. Hydrangeas likewise have a nickname called 'Change Rose'.
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