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. Undoubtedly the greatest types diversity is within eastern Asia, china notably, Japan, and Korea. The majority are shrubs 1 to 3 meters large, but some are small trees, while others lianas reaching up to 30 m (98 foot) by climbing up trees and shrubs. They could be either evergreen or deciduous, although cultivated temperate types are all deciduous generally.Having been introduced to the Azores, H. macrophylla is currently very common, on Faial particularly, which is recognized as the "blue island" due to the multitude of hydrangeas present on the island.Life cycleHydrangea bouquets are created from planting season to late fall months; they increase in flowerheads (corymbs or panicles) most often at the ends of the stems.
Typically the flowerheads contain two types of bouquets: small non-showy bouquets in the center or interior of the flowerhead, and large, showy blossoms with large colourful sepals (tepals). These showy bouquets are often lengthened in a engagement ring, or to the surface of the small flowers. Plants in crazy populations have few to nothing of the showy blossoms typically, while cultivated hydrangeas have been preferred and bred to have significantly more of the larger type bouquets.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 indicates, the comparative mind of your mop. In contrast, lacecap flowers bear round, flat flowerheads with a center core of subdued, small bouquets surrounded by outer jewelry of much larger flowers having showy tepals or sepals.
The blooms of some viburnums and rhododendrons can seem, at first glance, similar to those of some hydrangeas.Land and colors acidityIn most kinds the plants are white, but in some varieties (notably H. macrophylla), can be blue, red, red, light crimson, or dark crimson. In these species the color is influenced by the existence of metal ions which are available 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 presence of aluminium ions which may be adopted into hyperaccumulating plant life.[6] Reducing the pH of potting soils or mixes usually will not change the bloom color to blue, because these soils have no aluminum ions. The capability to blue or green a hydrangea is also influenced by the cultivar. Some plants are selected because of their 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 damaged by aluminum and can't be changed or shifted. Hydrangeas also have a nickname called 'Change Rose'.
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