Hydrangea (/ha?'dre?nd?i?/;common names 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. By far the greatest varieties diversity is in eastern Asia, notably China, Japan, and Korea. Most are shrubs 1 to 3 meters tall, however, many are small trees, as well as others lianas achieving up to 30 m (98 foot) by climbing up trees. They can be either deciduous or evergreen, although extensively cultivated temperate types are all deciduous.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 vast number of hydrangeas present on the island.Life cycleHydrangea plants are created from planting season to late fall months; they develop in flowerheads (corymbs or panicles) frequently at the ends of the stems.
Usually the flowerheads contain two types of blossoms: small non-showy plants in the guts or interior of the flowerhead, and large, showy plants with large multi-colored sepals (tepals). These showy plants are long in a engagement ring often, or to the exterior of the small flowers. Plant life in wild populations typically have few to none of the showy plants, while cultivated hydrangeas have been preferred and bred to have significantly more of the bigger type bouquets.There are two flower arrangements in hydrangeas with Corymb style inflorescens, which includes the commonly grown "bigleaf hydrangea"--Hydrangea macrophylla. Mophead blossoms are large round flowerheads resembling pom-poms or, as the name indicates, the brain of any mop. On the other hand, lacecap flowers bear round, flat flowerheads with a center core of subdued, small bouquets bounded by outer bands of bigger blooms having showy tepals or sepals.
The bouquets of some rhododendrons and viburnums can show up, initially, a lot like those of some hydrangeas.Colors and garden soil acidityIn most types the bouquets are white, however in some species (notably H. macrophylla), can be blue, red, pink, light purple, or dark purple. In these types the color is damaged by the presence of light weight aluminum ions which are available or tied up depending upon the land pH. For H. macrophylla and H. 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 lead to pink or red flowers.
This is the effect of a color change of the blossom pigments in the occurrence of aluminium ions that can be adopted into hyperaccumulating plant life.[6] Reducing 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 capability to blue or green a hydrangea is also influenced by the cultivar. Some plants are selected because of their ability to be blued, while some are bred and selected to be red, pink or white. 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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