Hydrangea (/ha?'dre?nd?i?/;common names hydrangea or hortensia) is a genus of 70-75 species of flowering vegetation local to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. Definitely the greatest types diversity is eastern Asia, notably China, Japan, and Korea. Most are shrubs 1 to 3 meters high, however, many are small trees and shrubs, as well as others lianas attaining up to 30 m (98 ft) by climbing up trees and shrubs. They could be either deciduous or evergreen, though the cultivated temperate kinds are all deciduous widely.Having been introduced to the Azores, H. macrophylla is quite typical now, on Faial particularly, which is recognized as the "blue island" due to the vast number of hydrangeas present on the island.Life cycleHydrangea blooms are produced from planting season to late autumn; they grow in flowerheads (corymbs or panicles) frequently at the ends of the stems.
Typically the flowerheads contain two types of plants: small non-showy blossoms in the center or interior of the flowerhead, and large, showy flowers with large colourful sepals (tepals). These showy flowers are prolonged in a band often, or to the surface of the tiny flowers. Plants in outdoors populations have few to nothing of the showy plants typically, while cultivated hydrangeas have been bred and preferred to have significantly more of the bigger type blossoms.There are two flower arrangements in hydrangeas with Corymb style inflorescens, which includes the commonly grown "bigleaf hydrangea"--Hydrangea macrophylla. Mophead plants are large round flowerheads resembling pom-poms or, as the name means, the comparative head of the mop. In contrast, lacecap flowers bear round, flat flowerheads with a center core of subdued, small plants ornamented by outer wedding rings of bigger blooms having showy tepals or sepals.
The flowers of some viburnums and rhododendrons can seem, at first glance, comparable to those of some hydrangeas.Soil and colors acidityIn most varieties the blooms are white, however in some varieties (notably H. macrophylla), can be blue, red, red, light crimson, or dark purple. In these varieties the color is afflicted by the existence of lightweight aluminum ions which can be found or tied up depending upon the land 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 have available 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 the effect of a color change of the rose pigments in the occurrence of aluminium ions that can be taken up into hyperaccumulating crops.[6] Minimizing 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 green a hydrangea is inspired 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 damaged by aluminum and cannot be changed or shifted. Hydrangeas likewise have a nickname called 'Change Rose'.
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