Hydrangea (/ha?'dre?nd?i?/;common names hydrangea or hortensia) is a genus of 70-75 types of flowering vegetation local to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. Undoubtedly the greatest species diversity is eastern Asia, notably China, Japan, and Korea. Most are shrubs 1 to 3 meters tall, but some are small trees and shrubs, among others lianas reaching up to 30 m (98 feet) by climbing up trees. They could be either evergreen or deciduous, although greatly cultivated temperate kinds are deciduous.Having been introduced to the Azores, H. macrophylla is very common now, on Faial particularly, which is known as the "blue island" due to the multitude of hydrangeas present on the island.Life cycleHydrangea plants are created from planting season to late fall months; they grow in flowerheads (corymbs or panicles) frequently at the ends of the stems.
Usually the flowerheads contain two types of blooms: small non-showy bouquets in the center or interior of the flowerhead, and large, showy bouquets with large colourful sepals (tepals). These showy blossoms are extended in a band often, or to the surface of the small flowers. Plant life in outrageous populations routinely have few to none of the showy blossoms, while cultivated hydrangeas have been bred and chosen to have significantly more of the bigger type flowers.There are two flower arrangements in hydrangeas with Corymb style inflorescens, which include the commonly grown "bigleaf hydrangea"--Hydrangea macrophylla. Mophead bouquets are large rounded flowerheads resembling pom-poms or, as the name indicates, the comparative head of your mop. On the other hand, lacecap flowers bear round, flat flowerheads with a center core of subdued, small plants bounded by outer rings of bigger bouquets having showy tepals or sepals.
The blossoms of some viburnums and rhododendrons can look, initially, comparable to those of some hydrangeas.Colors and ground acidityIn most types the bouquets are white, however in some types (notably H. macrophylla), can be blue, red, green, light crimson, or dark crimson. In these types the colour is influenced by the presence of metal ions which can be found or tied up depending upon the dirt pH. For H. macrophylla and H. 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 typically produce flowers that are blue to purple, whereas an alkaline soil (pH above 7) will tie up aluminum ions and result in pink or red flowers.
This is caused by a color change of the flower pigments in the presence of aluminium ions that can be adopted into hyperaccumulating vegetation.[6] Minimizing the pH of potting soils or mixes usually will not change the rose color to blue, because these soils haven't any aluminum ions. The ability to blue or green a hydrangea is influenced by the cultivar also. Some plants are selected for his or her ability to be blued, while others are bred and selected to be red, white or pink. The flower color of all other Hydrangea species is not afflicted by aluminum and cannot be changed or shifted. Hydrangeas likewise have a nickname called 'Change Rose'.
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