Hydrangea (/ha?'dre?nd?i?/;common names hydrangea or hortensia) is a genus of 70-75 types of flowering vegetation indigenous to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. By far the greatest species diversity is within eastern Asia, china notably, Japan, and Korea. Most are shrubs 1 to 3 meters tall, however, many are small trees, among others lianas getting up to 30 m (98 ft) by climbing up trees and shrubs. They can be either deciduous or evergreen, though the cultivated temperate varieties are all deciduous broadly.Having been introduced to the Azores, H. macrophylla is very common now, on Faial particularly, which is recognized as the "blue island" because of the vast number of hydrangeas present on the island.Life cycleHydrangea flowers are created from planting season to late fall months; they develop in flowerheads (corymbs or panicles) most often at the ends of the stems.
Typically the flowerheads contain two types of blooms: small non-showy blooms in the center or interior of the flowerhead, and large, showy blooms with large brilliant sepals (tepals). These showy bouquets are prolonged in a ring often, or to the surface of the tiny flowers. Crops in outdoors populations have few to none of the showy plants typically, while cultivated hydrangeas have been bred and determined to have 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 blooms are large spherical flowerheads resembling pom-poms or, as the name means, the comparative head of the mop. In contrast, 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 appear, at first glance, very much like those of some hydrangeas.Earth and colors acidityIn most varieties the blooms are white, but in some varieties (notably H. macrophylla), can be blue, red, pink, light crimson, or dark purple. In these varieties the color is afflicted by the presence of metal ions which can be found or tangled up depending upon the earth 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 bring about pink or red flowers.
This is caused by a color change of the rose pigments in the presence of aluminium ions which can be adopted into hyperaccumulating crops.[6] Reducing the pH of potting soils or mixes usually will not change the flower color to blue, because these soils haven't any aluminum ions. The capability to blue or pink a hydrangea is also inspired by the cultivar. Some plants are selected because of their ability to be blued, while others are bred and selected to be red, pink or white. The flower color of most 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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