Hydrangea (/ha?'dre?nd?i?/;common titles hydrangea or hortensia) is a genus of 70-75 types of flowering plants native to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. Undoubtedly the greatest varieties diversity is within eastern Asia, notably China, Japan, and Korea. The majority are shrubs 1 to 3 meters large, however, many are small trees, as well as others lianas achieving up to 30 m (98 ft) by climbing up trees. They can be either deciduous or evergreen, although cultivated temperate types are deciduous generally.Having been introduced to the Azores, H. macrophylla is now very common, 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 planting season to late fall; they grow in flowerheads (corymbs or panicles) most often at the ends of the stems.
Typically the flowerheads contain two types of flowers: small non-showy blooms in the guts or interior of the flowerhead, and large, showy plants with large colourful sepals (tepals). These showy flowers are often long in a diamond ring, or to the exterior of the small flowers. Crops in wild populations routinely have few to none of them of the showy bouquets, while cultivated hydrangeas have been preferred and bred to have significantly more of the larger type plants.There are two flower arrangements in hydrangeas with Corymb style inflorescens, which includes the commonly grown "bigleaf hydrangea"--Hydrangea macrophylla. Mophead blossoms are large spherical flowerheads resembling pom-poms or, as the name implies, the relative mind of a mop. On the other hand, lacecap flowers bear round, flat flowerheads with a center core of subdued, small blooms ornamented by outer rings of greater blossoms having showy tepals or sepals.
The flowers of some viburnums and rhododendrons can seem, at first glance, a lot like those of some hydrangeas.Land and colors acidityIn most varieties the bouquets are white, but in some kinds (notably H. macrophylla), can be blue, red, pink, light purple, or dark purple. In these types the colour is affected by the existence of metal ions which are available or tangled up depending upon the ground pH. For H. h and macrophylla. 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 blossom pigments in the existence of aluminium ions which can be taken up into hyperaccumulating crops.[6] Decreasing the pH of potting soils or mixes usually does not change the rose color to blue, because these soils haven't any aluminum ions. The capability to blue or green a hydrangea is inspired by the cultivar also. 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 most other Hydrangea species is not influenced by aluminum and can't be changed or shifted. Hydrangeas likewise have a nickname called 'Change Rose'.
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