Hydrangea (/ha?'dre?nd?i?/;common names hydrangea or hortensia) is a genus of 70-75 species of flowering plant life local to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. Probably the greatest species diversity is at eastern Asia, china notably, Japan, and Korea. Most are shrubs 1 to 3 meters tall, however, many are small trees and shrubs, while others lianas achieving up to 30 m (98 ft) by climbing up trees and shrubs. They could be either deciduous or evergreen, although generally cultivated temperate species are deciduous.Having been introduced to the Azores, H. macrophylla is quite typical now, on Faial particularly, which is recognized as the "blue island" because of the multitude of hydrangeas present on the island.Life cycleHydrangea plants are created from planting season to late autumn; they increase 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 flowers with large vibrant sepals (tepals). These showy flowers are long in a ring often, or to the exterior of the tiny flowers. Plants in outdoors populations have few to none of them of the showy blooms typically, while cultivated hydrangeas have been preferred and bred to have significantly more of the larger type blooms.There are two flower arrangements in hydrangeas with Corymb style inflorescens, which includes the commonly grown "bigleaf hydrangea"--Hydrangea macrophylla. Mophead blooms are large circular flowerheads resembling pom-poms or, as the name means, the comparative brain of the mop. On the other hand, lacecap flowers bear round, flat flowerheads with a center core of subdued, small flowers encircled by outer jewelry of greater blooms having showy tepals or sepals.
The blossoms of some rhododendrons and viburnums can seem, at first glance, very much like those of some hydrangeas.Ground and colors acidityIn most species the blooms are white, however in some types (notably H. macrophylla), can be blue, red, red, light crimson, or dark purple. In these species the colour is affected by the occurrence of aluminum ions which are available or tangled up depending after the ground 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 bring about pink or red flowers.
This is caused by a color change of the blossom pigments in the existence of aluminium ions which can be taken up into hyperaccumulating vegetation.[6] Cutting down the pH of potting soils or mixes usually will not change the bloom color to blue, because these soils have no aluminum ions. The capability to blue or pink a hydrangea is affected by the cultivar also. Some plants are selected for their ability to be blued, while some are bred and selected to be red, pink or white. The flower color of all other Hydrangea species is not influenced by aluminum and can't be changed or shifted. Hydrangeas likewise have a nickname called 'Change Rose'.
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