Hydrangea (/ha?'dre?nd?i?/;common titles hydrangea or hortensia) is a genus of 70-75 varieties of flowering plants native to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. By far the greatest varieties diversity is at eastern Asia, notably China, Japan, and Korea. Most are shrubs 1 to 3 meters high, however, many are small trees and shrubs, while others lianas getting up to 30 m (98 foot) by climbing up trees and shrubs. They can be either evergreen or deciduous, though the cultivated temperate species are deciduous widely.Having been introduced to the Azores, H. macrophylla is very common now, particularly on Faial, which is known as the "blue island" because of the vast number of hydrangeas present on the island.Life cycleHydrangea blossoms are produced from early spring to late fall months; they develop in flowerheads (corymbs or panicles) frequently at the ends of the stems.
Usually the flowerheads contain two types of flowers: small non-showy flowers in the guts or interior of the flowerhead, and large, showy bouquets with large colorful sepals (tepals). These showy blooms are often expanded in a band, or to the surface of the small flowers. Crops in crazy populations routinely have few to none of them of the showy blossoms, while cultivated hydrangeas have been picked and bred to have significantly more of the bigger 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 round flowerheads resembling pom-poms or, as the name signifies, the mind of your mop. In contrast, lacecap flowers bear round, flat flowerheads with a center core of subdued, small blooms surrounded by outer jewelry of bigger blooms having showy tepals or sepals.
The blooms of some rhododendrons and viburnums can seem, at first glance, just like those of some hydrangeas.Dirt and colors acidityIn most kinds the blossoms are white, but in some varieties (notably H. macrophylla), can be blue, red, red, light crimson, or dark purple. In these types the color is afflicted by the occurrence of light weight aluminum ions which can be found or tied up depending upon the earth 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 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 bring about pink or red flowers.
This is caused by a color change of the flower pigments in the occurrence of aluminium ions which can be taken up into hyperaccumulating crops.[6] Bringing down 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 affected by the cultivar. 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 most other Hydrangea species is not damaged by aluminum and cannot be changed or shifted. Hydrangeas likewise have a nickname called 'Change Rose'.
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