Hydrangea (/ha?'dre?nd?i?/;common labels hydrangea or hortensia) is a genus of 70-75 types of flowering crops native to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. Probably the greatest kinds 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 attaining up to 30 m (98 ft) by climbing up trees and shrubs. They could be either evergreen or deciduous, though the widely cultivated temperate kinds are all deciduous.Having been introduced to the Azores, H. macrophylla is currently very common, 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 autumn; they develop in flowerheads (corymbs or panicles) most often at the ends of the stems.
Typically the flowerheads contain two types of bouquets: small non-showy blooms in the guts or interior of the flowerhead, and large, showy flowers with large bright colored sepals (tepals). These showy flowers are often prolonged in a diamond ring, or to the surface of the tiny flowers. Plant life in wild populations routinely have few to nothing of the showy blooms, while cultivated hydrangeas have been bred and preferred to have significantly more of the bigger type flowers.There are two flower arrangements in hydrangeas with Corymb style inflorescens, which includes the commonly grown "bigleaf hydrangea"--Hydrangea macrophylla. Mophead blossoms are large circular flowerheads resembling pom-poms or, as the name indicates, the mind of your mop. In contrast, lacecap flowers bear round, flat flowerheads with a center core of subdued, small bouquets surrounded by outer bands of greater plants having showy tepals or sepals.
The flowers of some rhododendrons and viburnums can look, initially, similar to those of some hydrangeas.Dirt and colors acidityIn most species the blooms are white, but in some kinds (notably H. macrophylla), can be blue, red, green, light crimson, or dark purple. In these species the colour is affected by the presence of aluminum ions which are available or tangled 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 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 lead to pink or red flowers.
This is the effect of a color change of the bloom pigments in the occurrence of aluminium ions which can be adopted into hyperaccumulating crops.[6] Reducing the pH of potting soils or mixes usually will not change the bloom color to blue, because these soils have no aluminum ions. The ability to blue or green a hydrangea is influenced by the cultivar also. 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 all other Hydrangea species is not influenced by aluminum and can't be changed or shifted. Hydrangeas likewise have a nickname called 'Change Rose'.
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