Hydrangea (/ha?'dre?nd?i?/;common names hydrangea or hortensia) is a genus of 70-75 species of flowering crops native to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. Probably the greatest species diversity is at eastern Asia, notably China, Japan, and Korea. Most are shrubs 1 to 3 meters extra tall, however, many are small trees, while others lianas attaining up to 30 m (98 ft) by climbing up trees and shrubs. They can be either deciduous or evergreen, although cultivated temperate varieties are all deciduous greatly.Having been introduced to the Azores, H. macrophylla is very common now, on Faial particularly, which is recognized as the "blue island" due to the vast number of hydrangeas present on the island.Life cycleHydrangea blooms 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 blooms: small non-showy bouquets in the guts or interior of the flowerhead, and large, showy flowers with large colorful sepals (tepals). These showy bouquets are often expanded in a ring, or to the surface of the small flowers. Plants in untamed populations routinely have few to none of them of the showy blossoms, while cultivated hydrangeas have been selected and bred to have significantly 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 blooms are large circular flowerheads resembling pom-poms or, as the name signifies, the mind of an mop. In contrast, lacecap flowers bear round, flat flowerheads with a center core of subdued, small flowers encircled by outer wedding rings of greater plants having showy tepals or sepals.
The bouquets of some rhododendrons and viburnums can look, initially, a lot like those of some hydrangeas.Earth and colors acidityIn most kinds the flowers are white, but in some species (notably H. macrophylla), can be blue, red, pink, light purple, or dark purple. In these kinds the color is affected by the occurrence of lightweight aluminum ions which are available or tangled up depending upon the dirt 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 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 rose pigments in the presence of aluminium ions which is often taken up into hyperaccumulating crops.[6] Decreasing the pH of potting soils or mixes usually will not change the flower color to blue, because these soils have no 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 some are bred and selected to be red, pink or white. The flower color of most other Hydrangea species is not influenced by aluminum and cannot be changed or shifted. Hydrangeas also have a nickname called 'Change Rose'.
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