Hydrangea (/ha?'dre?nd?i?/;common labels 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. Definitely the greatest species diversity is in eastern Asia, notably China, Japan, and Korea. The majority are shrubs 1 to 3 meters tall, however, many are small trees, among others lianas getting up to 30 m (98 ft) by climbing up trees and shrubs. They can be either evergreen or deciduous, although cultivated temperate kinds are deciduous broadly.Having been introduced to the Azores, H. macrophylla is currently very common, on Faial particularly, which is recognized as the "blue island" due to the vast number of hydrangeas present on the island.Life cycleHydrangea bouquets are produced from early spring to late autumn; they increase in flowerheads (corymbs or panicles) frequently at the ends of the stems.
Usually the flowerheads contain two types of plants: small non-showy flowers in the guts or interior of the flowerhead, and large, showy blossoms with large vibrant sepals (tepals). These showy blossoms are often long in a diamond ring, or to the surface of the small flowers. Plant life in outrageous populations routinely have few to none of them of the showy flowers, while cultivated hydrangeas have been preferred 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 flowers are large round flowerheads resembling pom-poms or, as the name indicates, the relative head of an mop. In contrast, lacecap flowers bear round, flat flowerheads with a center core of subdued, small blooms bounded by outer bands of much larger bouquets having showy tepals or sepals.
The flowers of some rhododendrons and viburnums can seem, at first glance, a lot like those of some hydrangeas.Colors and land acidityIn most kinds the flowers are white, but in some varieties (notably H. macrophylla), can be blue, red, red, light crimson, or dark crimson. In these varieties the colour is affected by the occurrence of aluminium ions which can be found or tangled up depending upon the garden soil 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 cause pink or red flowers.
This is the effect of a color change of the flower pigments in the presence of aluminium ions which may be taken up into hyperaccumulating crops.[6] Lowering the pH of potting soils or mixes usually does not change the rose color to blue, because these soils have no aluminum ions. The ability to blue or pink a hydrangea is also influenced by the cultivar. Some plants are selected for their ability to be blued, while others are bred and selected to be red, pink or white. The flower color of most other Hydrangea species is not affected by aluminum and cannot be changed or shifted. Hydrangeas likewise have a nickname called 'Change Rose'.
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