Hydrangea (/ha?'dre?nd?i?/;common labels hydrangea or hortensia) is a genus of 70-75 species of flowering crops native to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. By far the greatest varieties diversity is in eastern Asia, china notably, Japan, and Korea. Most are shrubs 1 to 3 meters large, but some are small trees, while others lianas attaining up to 30 m (98 foot) by climbing up trees. They could be either evergreen or deciduous, although broadly cultivated temperate types are deciduous.Having been introduced to the Azores, H. macrophylla is currently very common, particularly on Faial, which is recognized as the "blue island" due to the multitude of hydrangeas present on the island.Life cycleHydrangea plants are created from planting season to late autumn; they expand in flowerheads (corymbs or panicles) most often at the ends of the stems.
Usually the flowerheads contain two types of blossoms: small non-showy flowers in the guts or interior of the flowerhead, and large, showy blossoms with large brilliant sepals (tepals). These showy bouquets tend to be extended in a wedding ring, or to the exterior of the small flowers. Vegetation in untamed populations have few to none of the showy flowers typically, while cultivated hydrangeas have been decided on and bred to have significantly more of the larger type blossoms.There are two flower arrangements in hydrangeas with Corymb style inflorescens, which include the commonly grown "bigleaf hydrangea"--Hydrangea macrophylla. Mophead flowers are large round flowerheads resembling pom-poms or, as the name indicates, the head of any mop. In contrast, lacecap flowers bear round, flat flowerheads with a center core of subdued, small blooms bounded by outer bands of bigger flowers having showy tepals or sepals.
The bouquets of some rhododendrons and viburnums can look, at first glance, a lot like those of some hydrangeas.Colors and dirt acidityIn most varieties the plants are white, however in some species (notably H. macrophylla), can be blue, red, pink, light purple, or dark crimson. In these kinds the colour is afflicted by the presence of light weight aluminum ions which can be found or tied up depending upon the soil 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 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 cause pink or red flowers.
This is caused by a color change of the flower pigments in the existence of aluminium ions which can be adopted into hyperaccumulating crops.[6] Cutting down the pH of potting soils or mixes usually does not change the rose color to blue, because these soils haven't any aluminum ions. The capability to blue or green a hydrangea is affected by the cultivar also. Some plants are selected for their ability to be blued, while some are bred and selected to be red, white or pink. 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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