Hydrangea (/ha?'dre?nd?i?/;common brands hydrangea or hortensia) is a genus of 70-75 species of flowering plants 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 extra tall, but some are small trees, as well as others lianas reaching up to 30 m (98 foot) by climbing up trees and shrubs. They can be either evergreen or deciduous, though the cultivated temperate species are deciduous greatly.Having been introduced to the Azores, H. macrophylla is now very common, particularly on Faial, which is recognized as the "blue island" because of the multitude of hydrangeas present on the island.Life cycleHydrangea bouquets are created from early spring to late fall; they grow in flowerheads (corymbs or panicles) frequently at the ends of the stems.
Usually the flowerheads contain two types of bouquets: small non-showy blooms in the guts or interior of the flowerhead, and large, showy bouquets with large colourful sepals (tepals). These showy blooms are prolonged in a ring often, or to the exterior of the small flowers. Plant life in untamed populations routinely have few to nothing of the showy blossoms, while cultivated hydrangeas have been chosen and bred to have significantly more of the bigger 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 round flowerheads resembling pom-poms or, as the name signifies, the relative head of a mop. On the other hand, lacecap flowers bear round, flat flowerheads with a center core of subdued, small blossoms bounded by outer rings of greater flowers having showy tepals or sepals.
The flowers of some rhododendrons and viburnums can appear, at first glance, just like those of some hydrangeas.Colors and ground acidityIn most kinds the blooms are white, but in some kinds (notably H. macrophylla), can be blue, red, green, light crimson, or dark crimson. In these kinds the colour is damaged by the presence of lightweight aluminum ions which are available or tied up depending after the ground 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 produce flowers that are blue to purple typically, 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 blossom pigments in the existence of aluminium ions which can be taken up into hyperaccumulating plants.[6] Lowering the pH of potting soils or mixes usually does not change the blossom color to blue, because these soils haven't any aluminum ions. The ability to blue or green a hydrangea is also affected by the cultivar. Some plants are selected because of their ability to be blued, while others are bred and selected to be red, white or pink. The flower color of most other Hydrangea species is not damaged by aluminum and cannot be changed or shifted. Hydrangeas likewise have a nickname called 'Change Rose'.
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