Hydrangea (/ha?'dre?nd?i?/;common labels hydrangea or hortensia) is a genus of 70-75 types of flowering crops indigenous to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. Definitely the greatest kinds diversity is eastern Asia, notably China, Japan, and Korea. Most are shrubs 1 to 3 meters extra tall, however, many are small trees and shrubs, yet others lianas achieving up to 30 m (98 feet) by climbing up trees. They could be either evergreen or deciduous, though the generally cultivated temperate species are all deciduous.Having been introduced to the Azores, H. macrophylla is very common now, particularly on Faial, which is recognized as the "blue island" due to the multitude of hydrangeas present on the island.Life cycleHydrangea blossoms are created from planting season to late autumn; they develop in flowerheads (corymbs or panicles) frequently at the ends of the stems.
Typically the flowerheads contain two types of blossoms: small non-showy bouquets in the guts or interior of the flowerhead, and large, showy blooms with large multi-colored sepals (tepals). These showy blossoms are prolonged in a engagement ring often, or to the surface of the small flowers. Plant life in outrageous populations typically have few to none of the showy plants, while cultivated hydrangeas have been bred and determined to have significantly more of the larger type flowers.There are two flower arrangements in hydrangeas with Corymb style inflorescens, which include the commonly grown "bigleaf hydrangea"--Hydrangea macrophylla. Mophead blossoms are large round flowerheads resembling pom-poms or, as the name means, the head of an mop. On the other hand, lacecap flowers bear round, flat flowerheads with a center core of subdued, small blooms ornamented by outer rings of greater flowers having showy tepals or sepals.
The blossoms of some rhododendrons and viburnums can seem, at first glance, similar to those of some hydrangeas.Colors and soil acidityIn most kinds the flowers are white, however in some species (notably H. macrophylla), can be blue, red, pink, light crimson, or dark crimson. In these types the color is affected by the presence of light weight aluminum ions which are available or tied up depending after 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 typically produce flowers that are blue to purple, whereas an alkaline soil (pH above 7) will tie up aluminum ions and bring about pink or red flowers.
This is caused by a color change of the blossom pigments in the presence of aluminium ions which may be taken up into hyperaccumulating crops.[6] Reducing the pH of potting soils or mixes usually does not change the flower color to blue, because these soils have no aluminum ions. The ability to blue or green a hydrangea is affected by the cultivar also. Some plants are selected for their ability to be blued, while some are bred and selected to be red, white or pink. The flower color of most other Hydrangea species is not damaged by aluminum and can't be changed or shifted. Hydrangeas likewise have a nickname called 'Change Rose'.
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