Hydrangea (/ha?'dre?nd?i?/;common names hydrangea or hortensia) is a genus of 70-75 species of flowering plants local to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. Probably the greatest kinds diversity is at eastern Asia, china notably, Japan, and Korea. The majority are shrubs 1 to 3 meters tall, but some are small trees and shrubs, while others lianas reaching up to 30 m (98 ft) by climbing up trees. They can be either evergreen or deciduous, although extensively cultivated temperate species are all deciduous.Having been introduced to the Azores, H. macrophylla is very common now, particularly on Faial, which is known as the "blue island" because of the multitude of hydrangeas present on the island.Life cycleHydrangea blooms are produced from planting season to late autumn; they expand in flowerheads (corymbs or panicles) most often at the ends of the stems.
Usually the flowerheads contain two types of bouquets: small non-showy bouquets in the guts or interior of the flowerhead, and large, showy bouquets with large colourful sepals (tepals). These showy bouquets tend to be prolonged in a diamond ring, or to the surface of the tiny flowers. Plant life in crazy 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 flowers.There are two flower arrangements in hydrangeas with Corymb style inflorescens, which includes the commonly grown "bigleaf hydrangea"--Hydrangea macrophylla. Mophead blooms are large circular flowerheads resembling pom-poms or, as the name signifies, the mind of an 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 bouquets of some viburnums and rhododendrons can look, at first glance, very much like those of some hydrangeas.Colors and garden soil acidityIn most varieties the blooms are white, however in some types (notably H. macrophylla), can be blue, red, green, light purple, or dark purple. In these types the color is afflicted by the presence of metal ions which are available or tied up depending upon the ground 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 cause pink or red flowers.
This is the effect of a color change of the rose pigments in the existence of aluminium ions which can be adopted into hyperaccumulating crops.[6] Bringing down the pH of potting soils or mixes usually will not change the rose color to blue, because these soils have no aluminum ions. The ability to blue or pink a hydrangea is influenced by the cultivar also. Some plants are selected for their ability to be blued, while others are bred and selected to be red, pink or white. 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'.
by jwburri · July 18, 2015, 3:39 am · Size : 173.18 KB · Resolution
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