Hydrangea (/ha?'dre?nd?i?/;common brands hydrangea or hortensia) is a genus of 70-75 varieties of flowering plant life local to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. Undoubtedly the greatest varieties diversity is within eastern Asia, notably China, Japan, and Korea. The majority are shrubs 1 to 3 meters high, but some are small trees and shrubs, as well as others lianas attaining up to 30 m (98 feet) by climbing up trees. They could be either evergreen or deciduous, although cultivated temperate varieties are all deciduous generally.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 blossoms are produced from early spring to late autumn; 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 plants in the center or interior of the flowerhead, and large, showy bouquets with large colourful sepals (tepals). These showy blossoms are prolonged in a diamond ring often, or to the surface of the tiny flowers. Plants in outrageous populations have few to nothing of the showy plants typically, while cultivated hydrangeas have been chosen and bred to have significantly 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 spherical flowerheads resembling pom-poms or, as the name signifies, the comparative head of a 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 blooms of some viburnums and rhododendrons can look, at first glance, a lot like those of some hydrangeas.Land and colors acidityIn most species the flowers are white, however in some types (notably H. macrophylla), can be blue, red, red, light purple, or dark crimson. In these kinds the colour is influenced by the existence of aluminium ions which are available or tangled up depending after 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 lead to pink or red flowers.
This is the effect of a color change of the bloom pigments in the presence of aluminium ions that can be adopted into hyperaccumulating vegetation.[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 ability to blue or pink a hydrangea is influenced by the cultivar also. Some plants are selected because of their ability to be blued, while others are bred and selected to be red, pink or white. The flower color of all other Hydrangea species is not affected by aluminum and cannot be changed or shifted. Hydrangeas also have a nickname called 'Change Rose'.
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