Hydrangea (/ha?'dre?nd?i?/;common names hydrangea or hortensia) is a genus of 70-75 species of flowering vegetation indigenous to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. Undoubtedly the greatest types diversity is at eastern Asia, notably China, Japan, and Korea. The majority are shrubs 1 to 3 meters extra tall, but some are small trees and shrubs, while others lianas reaching up to 30 m (98 feet) by climbing up trees and shrubs. They could be either evergreen or deciduous, though the greatly cultivated temperate kinds 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 plants are created from planting season to late fall; they grow in flowerheads (corymbs or panicles) frequently at the ends of the stems.
Usually the flowerheads contain two types of plants: small non-showy blossoms in the center or interior of the flowerhead, and large, showy blossoms with large vibrant sepals (tepals). These showy blooms are often lengthened in a diamond ring, or to the exterior of the small flowers. Crops in outrageous populations routinely have few to none of them of the showy bouquets, while cultivated hydrangeas have been selected and bred to have more of the bigger type bouquets.There are two flower arrangements in hydrangeas with Corymb style inflorescens, which include the commonly grown "bigleaf hydrangea"--Hydrangea macrophylla. Mophead blooms are large round flowerheads resembling pom-poms or, as the name suggests, the comparative mind of any 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 blossoms of some rhododendrons and viburnums can show up, at first glance, comparable to those of some hydrangeas.Earth and colors acidityIn most species the flowers are white, however in some types (notably H. macrophylla), can be blue, red, pink, light purple, or dark crimson. In these types the color is affected by the existence of metal 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 lead to pink or red flowers.
This is the effect of a color change of the blossom pigments in the existence of aluminium ions that can be adopted into hyperaccumulating plants.[6] Lowering 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 capability to blue or green 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'.
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