Hydrangea (/ha?'dre?nd?i?/;common names hydrangea or hortensia) is a genus of 70-75 varieties of flowering plants indigenous to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. Certainly the greatest species diversity is at eastern Asia, china notably, Japan, and Korea. Most are shrubs 1 to 3 meters large, however, many are small trees and shrubs, yet others lianas reaching up to 30 m (98 feet) by climbing up trees and shrubs. They can be either deciduous or evergreen, although generally cultivated temperate varieties are all deciduous.Having been introduced to the Azores, H. macrophylla is very common now, particularly on Faial, which is recognized as the "blue island" because of the vast number of hydrangeas present on the island.Life cycleHydrangea flowers are produced from early spring to late fall months; they grow in flowerheads (corymbs or panicles) frequently at the ends of the stems.
Usually the flowerheads contain two types of blooms: small non-showy blooms in the guts or interior of the flowerhead, and large, showy plants with large multi-colored sepals (tepals). These showy blooms tend to be long in a engagement ring, or to the exterior of the small flowers. Plants in wild populations routinely have few to none of them of the showy bouquets, while cultivated hydrangeas have been bred and decided on to have significantly more of the larger type bouquets.There are two flower arrangements in hydrangeas with Corymb style inflorescens, which includes the commonly grown "bigleaf hydrangea"--Hydrangea macrophylla. Mophead bouquets are large rounded flowerheads resembling pom-poms or, as the name suggests, the brain of the mop. On the other hand, lacecap flowers bear round, flat flowerheads with a center core of subdued, small blooms encircled by outer wedding rings of greater blossoms having showy tepals or sepals.
The blossoms of some viburnums and rhododendrons can appear, at first glance, much like those of some hydrangeas.Colors and dirt acidityIn most types the plants are white, but in some kinds (notably H. macrophylla), can be blue, red, pink, light crimson, or dark purple. In these species the color is afflicted by the existence of metal ions which can be found or tied 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 produce flowers that are blue to purple typically, 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 presence of aluminium ions that can be adopted into hyperaccumulating plant life.[6] Cutting down the pH of potting soils or mixes usually will not change the rose color to blue, because these soils haven't any aluminum ions. The ability to blue or green a hydrangea is influenced by the cultivar also. Some plants are selected for their ability to be blued, while others are bred and selected to be red, white or pink. The flower color of all other Hydrangea species is not influenced by aluminum and cannot be changed or shifted. Hydrangeas likewise have a nickname called 'Change Rose'.
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