Hydrangea (/ha?'dre?nd?i?/;common labels hydrangea or hortensia) is a genus of 70-75 varieties of flowering crops native to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. Certainly the greatest varieties diversity is eastern Asia, china notably, Japan, and Korea. The majority are shrubs 1 to 3 meters extra tall, but some are small trees, among others lianas getting up to 30 m (98 feet) by climbing up trees. They could be either evergreen or deciduous, though the broadly cultivated temperate varieties are deciduous.Having been introduced to the Azores, H. macrophylla is currently very common, particularly on Faial, which is known as the "blue island" because of the vast number of hydrangeas present on the island.Life cycleHydrangea plants are produced from early spring to late fall; they increase in flowerheads (corymbs or panicles) frequently at the ends of the stems.
Usually the flowerheads contain two types of flowers: small non-showy plants in the guts or interior of the flowerhead, and large, showy flowers with large colorful sepals (tepals). These showy bouquets tend to be long in a band, or to the exterior of the tiny flowers. Crops in untamed populations typically have few to none of the showy blossoms, while cultivated hydrangeas have been chosen and bred to have significantly more of the bigger type blooms.There are two flower arrangements in hydrangeas with Corymb style inflorescens, which includes the commonly grown "bigleaf hydrangea"--Hydrangea macrophylla. Mophead bouquets are large spherical flowerheads resembling pom-poms or, as the name indicates, the brain of the mop. In contrast, lacecap flowers bear round, flat flowerheads with a center core of subdued, small blossoms encircled by outer wedding rings of greater bouquets having showy tepals or sepals.
The bouquets of some viburnums and rhododendrons can appear, at first glance, a lot like those of some hydrangeas.Colors and earth acidityIn most kinds the bouquets are white, however in some species (notably H. macrophylla), can be blue, red, pink, light crimson, or dark crimson. In these varieties the colour is influenced by the occurrence of aluminum ions which can be found or tangled up depending upon the earth 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 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 result in pink or red flowers.
This is the effect of a color change of the flower pigments in the occurrence of aluminium ions which may be adopted into hyperaccumulating plants.[6] Cutting down the pH of potting soils or mixes usually will not change the bloom 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 for 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 damaged by aluminum and cannot be changed or shifted. Hydrangeas likewise have a nickname called 'Change Rose'.
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