Hydrangea (/ha?'dre?nd?i?/;common brands hydrangea or hortensia) is a genus of 70-75 species of flowering crops local to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. Certainly the greatest species diversity is in eastern Asia, notably China, Japan, and Korea. The majority are shrubs 1 to 3 meters high, however, many are small trees and shrubs, as well as others lianas getting up to 30 m (98 ft) by climbing up trees. They could be either evergreen or deciduous, though the greatly cultivated temperate types are all deciduous.Having been introduced to the Azores, H. macrophylla is now very common, on Faial particularly, 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 autumn; they expand in flowerheads (corymbs or panicles) most often at the ends of the stems.
Typically the flowerheads contain two types of bouquets: small non-showy bouquets in the center or interior of the flowerhead, and large, showy blooms with large brilliant sepals (tepals). These showy flowers are often prolonged in a band, or to the exterior of the tiny flowers. Vegetation in crazy populations typically have few to nothing of the showy bouquets, while cultivated hydrangeas have been bred and selected to have significantly more of the larger type bouquets.There are two flower arrangements in hydrangeas with Corymb style inflorescens, which includes the commonly grown "bigleaf hydrangea"--Hydrangea macrophylla. Mophead plants are large spherical flowerheads resembling pom-poms or, as the name implies, the head of the mop. On the other hand, lacecap flowers bear round, flat flowerheads with a center core of subdued, small bouquets encircled by outer rings of bigger bouquets having showy tepals or sepals.
The bouquets of some rhododendrons and viburnums can seem, at first glance, just like those of some hydrangeas.Land and colors acidityIn most kinds the blossoms are white, but in some species (notably H. macrophylla), can be blue, red, green, light purple, or dark purple. In these kinds the colour is influenced by the existence of metal ions which are available or tied up depending after the 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 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 lead to pink or red flowers.
This is caused by a color change of the rose pigments in the presence of aluminium ions which is often adopted into hyperaccumulating plants.[6] Minimizing the pH of potting soils or mixes usually will not change the rose color to blue, because these soils haven't any aluminum ions. The ability to blue or pink a hydrangea is inspired by the cultivar also. Some plants are selected because of their ability to be blued, while others are bred and selected to be red, white or pink. The flower color of all other Hydrangea species is not afflicted by aluminum and can't be changed or shifted. Hydrangeas likewise have a nickname called 'Change Rose'.
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