Hydrangea (/ha?'dre?nd?i?/;common names hydrangea or hortensia) is a genus of 70-75 species of flowering plants native to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. Probably the greatest types diversity is within eastern Asia, china notably, Japan, and Korea. Most are shrubs 1 to 3 meters large, however, many are small trees and shrubs, and more lianas reaching up to 30 m (98 foot) by climbing up trees. They could be either deciduous or evergreen, though the widely cultivated temperate kinds are deciduous.Having been introduced to the Azores, H. macrophylla is quite typical now, on Faial particularly, which is recognized as the "blue island" because of the vast number of hydrangeas present on the island.Life cycleHydrangea blossoms are created from early spring to late fall; they increase in flowerheads (corymbs or panicles) frequently at the ends of the stems.
Typically the flowerheads contain two types of bouquets: small non-showy plants in the center or interior of the flowerhead, and large, showy plants with large bright colored sepals (tepals). These showy plants are extended in a ring often, or to the surface of the small flowers. Plants in outrageous populations have few to none of them of the showy flowers typically, while cultivated hydrangeas have been selected and bred to have more of the larger type blossoms.There are two flower arrangements in hydrangeas with Corymb style inflorescens, which include the commonly grown "bigleaf hydrangea"--Hydrangea macrophylla. Mophead plants are large circular flowerheads resembling pom-poms or, as the name indicates, the comparative brain of the mop. On the other hand, lacecap flowers bear round, flat flowerheads with a center core of subdued, small blossoms bounded by outer bands of much larger blossoms having showy tepals or sepals.
The flowers of some rhododendrons and viburnums can look, at first glance, just like those of some hydrangeas.Colors and earth acidityIn most kinds the flowers are white, but in some kinds (notably H. macrophylla), can be blue, red, pink, light crimson, or dark crimson. In these kinds the colour is afflicted by the presence of metal ions which can be found or tangled up depending upon the earth 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 supply aluminum ions and produce flowers that are blue to purple typically, 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 presence of aluminium ions which is often taken up into hyperaccumulating plant life.[6] Bringing down the pH of potting soils or mixes usually does not change the rose color to blue, because these soils have no aluminum ions. The capability to blue or pink a hydrangea is inspired by the cultivar also. Some plants are selected for his or her ability to be blued, while some are bred and selected to be red, pink or white. The flower color of all other Hydrangea species is not affected by aluminum and cannot be changed or shifted. Hydrangeas likewise have a nickname called 'Change Rose'.
Purple Hydrangea Flickr Photo Sharing!
Chad Purser Photography
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hydrangea 021 purple hydrangea 2 olympus digital camera olympus
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