Hydrangea (/ha?'dre?nd?i?/;common brands hydrangea or hortensia) is a genus of 70-75 varieties of flowering plant life indigenous to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. Undoubtedly the greatest types diversity is in eastern Asia, notably China, Japan, and Korea. The majority are shrubs 1 to 3 meters extra tall, but some are small trees, yet others lianas attaining up to 30 m (98 foot) by climbing up trees and shrubs. They can be either evergreen or deciduous, 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 vast number of hydrangeas present on the island.Life cycleHydrangea bouquets are created from early spring to late fall; they increase in flowerheads (corymbs or panicles) frequently at the ends of the stems.
Usually the flowerheads contain two types of blooms: small non-showy blooms in the center or interior of the flowerhead, and large, showy bouquets with large brilliant sepals (tepals). These showy blooms are often long in a diamond ring, or to the exterior of the tiny flowers. Plant life in outdoors populations have few to nothing of the showy blossoms typically, while cultivated hydrangeas have been bred and determined to have significantly more of the larger type blooms.There are two flower arrangements in hydrangeas with Corymb style inflorescens, which includes the commonly grown "bigleaf hydrangea"--Hydrangea macrophylla. Mophead plants are large round flowerheads resembling pom-poms or, as the name indicates, the brain of your 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 viburnums and rhododendrons can look, initially, much like those of some hydrangeas.Colors and earth acidityIn most kinds the blossoms are white, however in some varieties (notably H. macrophylla), can be blue, red, pink, light crimson, or dark purple. In these species the color is affected by the occurrence of metal ions which are available or tied up depending upon the land pH. For H. h and macrophylla. 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 cause pink or red flowers.
This is the effect of a color change of the bloom pigments in the occurrence of aluminium ions which can be adopted into hyperaccumulating plant life.[6] Bringing down the pH of potting soils or mixes usually will not change the bloom color to blue, because these soils have no aluminum ions. The ability 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 most other Hydrangea species is not affected by aluminum and can't be changed or shifted. Hydrangeas also have a nickname called 'Change Rose'.
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