Hydrangea (/ha?'dre?nd?i?/;common brands hydrangea or hortensia) is a genus of 70-75 varieties of flowering plants local to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. Definitely the greatest varieties diversity is within eastern Asia, notably China, Japan, and Korea. The majority are shrubs 1 to 3 meters extra tall, but some are small trees, while others lianas getting up to 30 m (98 feet) by climbing up trees. They could be either deciduous or evergreen, although cultivated temperate kinds are all deciduous generally.Having been introduced to the Azores, H. macrophylla is now 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 planting season to late autumn; they develop in flowerheads (corymbs or panicles) most often at the ends of the stems.
Typically the flowerheads contain two types of blossoms: small non-showy flowers in the guts or interior of the flowerhead, and large, showy blossoms with large colourful sepals (tepals). These showy plants are expanded in a wedding ring often, or to the exterior of the tiny flowers. Plant life in untamed populations have few to none of them of the showy bouquets typically, while cultivated hydrangeas have been bred and selected to have 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 flowers are large round flowerheads resembling pom-poms or, as the name suggests, the head of an mop. On the other hand, lacecap flowers bear round, flat flowerheads with a center core of subdued, small plants encircled by outer bands of much larger bouquets having showy tepals or sepals.
The flowers of some viburnums and rhododendrons can appear, at first glance, very much like those of some hydrangeas.Colors and ground acidityIn most species the flowers are white, however in some kinds (notably H. macrophylla), can be blue, red, green, light crimson, or dark purple. In these kinds the color is influenced by the presence of aluminum ions which can be found or tangled up depending upon the dirt 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 flower pigments in the existence of aluminium ions which may be adopted into hyperaccumulating crops.[6] Lowering the pH of potting soils or mixes usually does not change the flower color to blue, because these soils have no aluminum ions. The capability to blue or green a hydrangea is inspired by the cultivar also. Some plants are selected for his or her 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 affected by aluminum and can't be changed or shifted. Hydrangeas also have a nickname called 'Change Rose'.
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