Hydrangea (/ha?'dre?nd?i?/;common labels hydrangea or hortensia) is a genus of 70-75 species of flowering plants indigenous to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. Certainly the greatest types diversity is in eastern Asia, notably China, Japan, and Korea. Most are shrubs 1 to 3 meters large, but some are small trees, and others lianas reaching up to 30 m (98 foot) by climbing up trees and shrubs. They could be either evergreen or deciduous, although extensively cultivated temperate varieties are all deciduous.Having been introduced to the Azores, H. macrophylla is quite typical now, particularly on Faial, which is known as the "blue island" due to the multitude of hydrangeas present on the island.Life cycleHydrangea bouquets are created from early spring to late fall; they develop in flowerheads (corymbs or panicles) most often at the ends of the stems.
Usually the flowerheads contain two types of flowers: small non-showy blossoms in the guts or interior of the flowerhead, and large, showy blossoms with large vibrant sepals (tepals). These showy flowers are often expanded in a band, or to the surface of the small flowers. Vegetation in outrageous populations have few to none of the showy blossoms typically, while cultivated hydrangeas have been preferred and bred to have significantly more of the larger type bouquets.There are two flower arrangements in hydrangeas with Corymb style inflorescens, which include the commonly grown "bigleaf hydrangea"--Hydrangea macrophylla. Mophead bouquets are large round flowerheads resembling pom-poms or, as the name suggests, the mind of an 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 bouquets of some rhododendrons and viburnums can show up, initially, much like those of some hydrangeas.Soil and colors acidityIn most varieties the blossoms are white, however in some types (notably H. macrophylla), can be blue, red, red, light purple, or dark crimson. In these kinds the color is affected by the occurrence of aluminum ions which can be found or tied up depending after the ground 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 caused by a color change of the rose pigments in the existence of aluminium ions which can be adopted into hyperaccumulating plant life.[6] Decreasing the pH of potting soils or mixes usually will not change the flower color to blue, because these soils have no aluminum ions. The ability to blue or pink 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 all other Hydrangea species is not afflicted by aluminum and cannot be changed or shifted. Hydrangeas also have a nickname called 'Change Rose'.
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