Hydrangea (/ha?'dre?nd?i?/;common labels hydrangea or hortensia) is a genus of 70-75 varieties of flowering crops indigenous to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. Definitely the greatest varieties diversity is eastern Asia, notably China, Japan, and Korea. The majority are shrubs 1 to 3 meters large, but some are small trees and shrubs, while others lianas achieving up to 30 m (98 ft) by climbing up trees. They can be either deciduous or evergreen, though the generally cultivated temperate kinds are all deciduous.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 bouquets are produced from planting season to late autumn; they develop in flowerheads (corymbs or panicles) frequently at the ends of the stems.
Typically the flowerheads contain two types of flowers: small non-showy bouquets in the center or interior of the flowerhead, and large, showy bouquets with large multi-colored sepals (tepals). These showy flowers tend to be prolonged in a band, or to the exterior of the small flowers. Plant life in wild populations have few to nothing of the showy blooms typically, while cultivated hydrangeas have been bred and picked to have more of the larger type blooms.There are two flower arrangements in hydrangeas with Corymb style inflorescens, which include the commonly grown "bigleaf hydrangea"--Hydrangea macrophylla. Mophead bouquets 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 surrounded by outer rings of larger flowers having showy sepals or tepals.
The blossoms of some viburnums and rhododendrons can appear, at first glance, just like those of some hydrangeas.Garden soil and colors acidityIn most kinds the bouquets are white, however in some types (notably H. macrophylla), can be blue, red, green, light crimson, or dark purple. In these types the color is damaged by the existence of metal ions which are available or tied up depending upon the ground pH. For H. macrophylla and H. 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 the effect of a color change of the bloom pigments in the existence of aluminium ions which may be adopted into hyperaccumulating plant life.[6] Reducing 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 ability to blue or green a hydrangea is also affected 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 most other Hydrangea species is not influenced by aluminum and cannot be changed or shifted. Hydrangeas also have a nickname called 'Change Rose'.
Description Hortensia Hydrangea macrophylla, Calatayud, España 2012
Description Hydrangea arborescens 39;annabelle39;2.jpg
File:Hydrangeaceae Hydrangea macrophylla Mariesii.JPG Wikipedia
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