Hydrangea (/ha?'dre?nd?i?/;common titles hydrangea or hortensia) is a genus of 70-75 varieties of flowering vegetation local to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. Probably the greatest types diversity is in eastern Asia, notably China, Japan, and Korea. Most are shrubs 1 to 3 meters tall, but some are small trees and shrubs, among others lianas attaining up to 30 m (98 ft) by climbing up trees. They could be either evergreen or deciduous, although greatly cultivated temperate kinds 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 blossoms are created from early spring to late fall months; they grow in flowerheads (corymbs or panicles) frequently at the ends of the stems.
Typically the flowerheads contain two types of blossoms: small non-showy blooms in the center or interior of the flowerhead, and large, showy plants with large brilliant sepals (tepals). These showy plants are often prolonged in a diamond ring, or to the exterior of the small flowers. Vegetation in outdoors populations have few to nothing of the showy blooms typically, while cultivated hydrangeas have been selected and bred to have more of the bigger type bouquets.There are two flower arrangements in hydrangeas with Corymb style inflorescens, which include the commonly grown "bigleaf hydrangea"--Hydrangea macrophylla. Mophead flowers are large circular flowerheads resembling pom-poms or, as the name signifies, the head of an mop. In contrast, lacecap flowers bear round, flat flowerheads with a center core of subdued, small blooms encircled by outer rings of bigger blossoms having showy tepals or sepals.
The blooms of some viburnums and rhododendrons can look, at first glance, a lot like those of some hydrangeas.Land and colors acidityIn most types the blooms are white, but in some varieties (notably H. macrophylla), can be blue, red, green, light purple, or dark purple. In these species the colour is affected by the existence of aluminum ions which can be found or tangled up depending after the ground 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 typically produce flowers that are blue to purple, whereas an alkaline soil (pH above 7) will tie up aluminum ions and result in pink or red flowers.
This is caused by a color change of the blossom pigments in the presence of aluminium ions which is often adopted into hyperaccumulating plants.[6] Bringing down the pH of potting soils or mixes usually does not change the bloom color to blue, because these soils have no aluminum ions. The capability to blue or green a hydrangea is influenced by the cultivar also. Some plants are selected because of 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 affected by aluminum and can't be changed or shifted. Hydrangeas likewise have a nickname called 'Change Rose'.
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