Hydrangea (/ha?'dre?nd?i?/;common names hydrangea or hortensia) is a genus of 70-75 varieties of flowering plant life local to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. Undoubtedly the greatest species diversity is at eastern Asia, china notably, Japan, and Korea. Most are shrubs 1 to 3 meters extra tall, however, many are small trees and shrubs, yet others lianas attaining 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 all 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 vast number of hydrangeas present on the island.Life cycleHydrangea blooms are produced from early spring to late fall; they develop in flowerheads (corymbs or panicles) frequently at the ends of the stems.
Typically the flowerheads contain two types of plants: small non-showy bouquets in the guts or interior of the flowerhead, and large, showy bouquets with large multi-colored sepals (tepals). These showy flowers tend to be lengthened in a ring, or to the exterior of the small flowers. Vegetation in crazy populations routinely have few to none of the showy blooms, while cultivated hydrangeas have been bred and decided on 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 blooms are large circular flowerheads resembling pom-poms or, as the name implies, the relative mind of the mop. On the other hand, lacecap flowers bear round, flat flowerheads with a center core of subdued, small flowers surrounded by outer rings of larger flowers having showy sepals or tepals.
The flowers of some rhododendrons and viburnums can show up, initially, similar to those of some hydrangeas.Dirt and colors acidityIn most kinds the flowers are white, but in some varieties (notably H. macrophylla), can be blue, red, pink, light purple, or dark crimson. In these species the color is influenced by the existence of light weight aluminum ions which can be found or tangled up depending upon the dirt 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 produce flowers that are blue to purple typically, 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 occurrence of aluminium ions which can be adopted into hyperaccumulating plant life.[6] Minimizing the pH of potting soils or mixes usually will not change the blossom color to blue, because these soils have no aluminum ions. The capability to blue or pink a hydrangea is also influenced by the cultivar. Some plants are selected for 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 affected by aluminum and cannot be changed or shifted. Hydrangeas also have a nickname called 'Change Rose'.
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