Hydrangea (/ha?'dre?nd?i?/;common labels hydrangea or hortensia) is a genus of 70-75 types of flowering plant life indigenous 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 high, but some are small trees, as well as others lianas reaching up to 30 m (98 foot) by climbing up trees and shrubs. They could be either deciduous or evergreen, though the cultivated temperate species are all deciduous widely.Having been introduced to the Azores, H. macrophylla is now very common, particularly on Faial, which is recognized as the "blue island" due to the multitude of hydrangeas present on the island.Life cycleHydrangea blossoms are produced from early spring to late fall; they develop in flowerheads (corymbs or panicles) most often at the ends of the stems.
Typically the flowerheads contain two types of plants: small non-showy blossoms in the guts or interior of the flowerhead, and large, showy bouquets with large multi-colored sepals (tepals). These showy bouquets tend to be long in a diamond ring, or to the exterior of the tiny flowers. Vegetation in crazy populations typically have few to none of the showy plants, while cultivated hydrangeas have been bred and preferred to have significantly 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 plants are large round flowerheads resembling pom-poms or, as the name implies, the head of a mop. On the other hand, lacecap flowers bear round, flat flowerheads with a center core of subdued, small blossoms ornamented by outer jewelry of much larger bouquets having showy tepals or sepals.
The bouquets of some rhododendrons and viburnums can show up, at first glance, similar to those of some hydrangeas.Colors and land acidityIn most species the blooms are white, however in some types (notably H. macrophylla), can be blue, red, red, light purple, or dark crimson. In these varieties the colour is affected by the occurrence of aluminum ions which can be found or tangled up depending after the ground 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 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 caused by a color change of the bloom pigments in the existence of aluminium ions which may be taken up into hyperaccumulating plants.[6] Cutting down the pH of potting soils or mixes usually does not change the flower color to blue, because these soils haven't any aluminum ions. The capability to blue or green a hydrangea is also influenced by the cultivar. 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 influenced by aluminum and can't be changed or shifted. Hydrangeas also have a nickname called 'Change Rose'.
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