Hydrangea (/ha?'dre?nd?i?/;common brands hydrangea or hortensia) is a genus of 70-75 types of flowering plant life indigenous to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. Definitely the greatest species diversity is eastern Asia, notably China, Japan, and Korea. The majority are shrubs 1 to 3 meters high, but some are small trees, while others lianas achieving up to 30 m (98 feet) by climbing up trees. They could be either evergreen or deciduous, though the extensively cultivated temperate types are deciduous.Having been introduced to the Azores, H. macrophylla is now very common, on Faial particularly, which is known as the "blue island" because of the vast number of hydrangeas present on the island.Life cycleHydrangea bouquets are created from early spring to late fall; they develop in flowerheads (corymbs or panicles) frequently at the ends of the stems.
Usually the flowerheads contain two types of bouquets: small non-showy bouquets in the guts or interior of the flowerhead, and large, showy plants with large vibrant sepals (tepals). These showy plants tend to be expanded in a band, or to the exterior of the small flowers. Vegetation in outdoors populations have few to nothing of the showy blooms typically, while cultivated hydrangeas have been bred and decided on to have significantly 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 plants are large spherical flowerheads resembling pom-poms or, as the name means, the mind of the 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 blooms of some rhododendrons and viburnums can look, initially, very much like those of some hydrangeas.Colors and land acidityIn most kinds the bouquets are white, but in some varieties (notably H. macrophylla), can be blue, red, green, light purple, or dark crimson. In these types the color is damaged by the existence of aluminium ions which can be found or tied up depending upon the land pH. For H. macrophylla and H. serrata cultivars, the flower color can be determined by 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 bring about pink or red flowers.
This is caused by a color change of the flower pigments in the occurrence of aluminium ions that can be taken up into hyperaccumulating vegetation.[6] Bringing down the pH of potting soils or mixes usually does not change the blossom color to blue, because these soils have no aluminum ions. The ability to blue or pink a hydrangea is also influenced by the cultivar. 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 all other Hydrangea species is not damaged by aluminum and cannot be changed or shifted. Hydrangeas also have a nickname called 'Change Rose'.
Photo: Endless Summer ® Mophead Hydrangea H. macrophylla, Hicks
of Bigleaf Hydrangea, Mophead 39;Double Pink39; Hydrangea macrophylla
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