Hydrangea (/ha?'dre?nd?i?/;common brands hydrangea or hortensia) is a genus of 70-75 kinds of flowering plants native to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. Certainly the greatest varieties diversity is at eastern Asia, china notably, Japan, and Korea. Most are shrubs 1 to 3 meters tall, but some are small trees and shrubs, as well as others lianas achieving up to 30 m (98 feet) by climbing up trees. They can be either deciduous or evergreen, though the cultivated temperate varieties are all deciduous widely.Having been introduced to the Azores, H. macrophylla is quite typical now, on Faial particularly, which is known as the "blue island" due to the vast number of hydrangeas present on the island.Life cycleHydrangea plants are produced from planting season to late fall months; they expand in flowerheads (corymbs or panicles) frequently at the ends of the stems.
Typically the flowerheads contain two types of flowers: small non-showy bouquets in the center or interior of the flowerhead, and large, showy bouquets with large colourful sepals (tepals). These showy blossoms are often lengthened in a wedding ring, or to the surface of the tiny flowers. Crops in wild populations have few to none of them of the showy flowers typically, while cultivated hydrangeas have been bred and chosen to have significantly more of the bigger type plants.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 implies, the comparative brain of an mop. In contrast, lacecap flowers bear round, flat flowerheads with a center core of subdued, small blooms ornamented by outer jewelry of much larger blossoms having showy tepals or sepals.
The blossoms of some viburnums and rhododendrons can appear, initially, much like those of some hydrangeas.Dirt and colors acidityIn most varieties the flowers are white, however in some kinds (notably H. macrophylla), can be blue, red, pink, light purple, or dark crimson. In these kinds the colour is afflicted by the existence of aluminum ions which can be found or tangled up depending after the soil 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 lead to pink or red flowers.
This is the effect of a color change of the flower pigments in the occurrence of aluminium ions which can be adopted into hyperaccumulating crops.[6] Cutting down the pH of potting soils or mixes usually does not change the rose color to blue, because these soils have no 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 others are bred and selected to be red, white or pink. The flower color of all other Hydrangea species is not influenced by aluminum and can't be changed or shifted. Hydrangeas also have a nickname called 'Change Rose'.
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