Hydrangea (/ha?'dre?nd?i?/;common titles 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. By far the greatest types diversity is eastern Asia, notably China, Japan, and Korea. The majority are shrubs 1 to 3 meters tall, but some are small trees, and more lianas reaching up to 30 m (98 feet) by climbing up trees and shrubs. They can be either evergreen or deciduous, though the extensively cultivated temperate kinds are deciduous.Having been introduced to the Azores, H. macrophylla is now very common, on Faial particularly, which is known as the "blue island" due to the multitude of hydrangeas present on the island.Life cycleHydrangea bouquets are produced from planting season to late fall; they expand in flowerheads (corymbs or panicles) frequently at the ends of the stems.
Typically the flowerheads contain two types of flowers: small non-showy plants in the center or interior of the flowerhead, and large, showy flowers with large multi-colored sepals (tepals). These showy blossoms tend to be lengthened in a ring, or to the exterior of the small flowers. Plant life in outrageous populations have few to none of them of the showy flowers typically, while cultivated hydrangeas have been chosen and bred to have more of the bigger type flowers.There are two flower arrangements in hydrangeas with Corymb style inflorescens, which includes the commonly grown "bigleaf hydrangea"--Hydrangea macrophylla. Mophead bouquets are large spherical flowerheads resembling pom-poms or, as the name means, the mind of a 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 rhododendrons and viburnums can seem, at first glance, a lot like those of some hydrangeas.Colors and garden soil acidityIn most species the blooms are white, however in some kinds (notably H. macrophylla), can be blue, red, red, light purple, or dark crimson. In these types the color is influenced by the occurrence of aluminium ions which can be found or tangled 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 supply 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 the effect of a color change of the blossom pigments in the existence of aluminium ions which is often adopted into hyperaccumulating vegetation.[6] Decreasing the pH of potting soils or mixes usually does not change the flower color to blue, because these soils have no aluminum ions. The capability to blue or green a hydrangea is inspired by the cultivar also. Some plants are selected because of their ability to be blued, while some are bred and selected to be red, white or pink. The flower color of most other Hydrangea species is not damaged by aluminum and can't be changed or shifted. Hydrangeas also have a nickname called 'Change Rose'.
Hydrangea sargentiana Flower 27/07/2013, Kew Gardens, London
File:Hydrangea paniculata Prague 2013 2.jpg Wikimedia Commons
New Hydrangeas for 2013 and BeyondNotes from Northern Gardener
Description Hydrangea paniculata Prague 2013 1.jpg
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