Hydrangea (/ha?'dre?nd?i?/;common titles hydrangea or hortensia) is a genus of 70-75 varieties of flowering plants indigenous to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. By far the greatest types diversity is in eastern Asia, china notably, Japan, and Korea. The majority are shrubs 1 to 3 meters large, but some are small trees, and others lianas attaining up to 30 m (98 ft) by climbing up trees and shrubs. They could be either deciduous or evergreen, although generally 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 plants are produced 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 plants: small non-showy bouquets in the center or interior of the flowerhead, and large, showy plants with large colorful sepals (tepals). These showy flowers are often prolonged in a ring, or to the exterior of the small flowers. Plants in untamed populations have few to nothing of the showy plants typically, while cultivated hydrangeas have been bred and determined to have 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 blossoms are large round flowerheads resembling pom-poms or, as the name means, the comparative head of a mop. On the other hand, lacecap flowers bear round, flat flowerheads with a center core of subdued, small bouquets bounded by outer rings of bigger plants having showy tepals or sepals.
The blossoms of some viburnums and rhododendrons can seem, initially, a lot like those of some hydrangeas.Colors and earth acidityIn most types the bouquets are white, but in some kinds (notably H. macrophylla), can be blue, red, pink, light purple, or dark crimson. In these kinds the colour is affected by the occurrence of metal ions which are available 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 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 bring about pink or red flowers.
This is caused by a color change of the blossom pigments in the occurrence of aluminium ions which may be adopted into hyperaccumulating plant life.[6] Cutting down the pH of potting soils or mixes usually will not change the blossom color to blue, because these soils haven't any aluminum ions. The capability to blue or pink a hydrangea is also influenced by the cultivar. Some plants are selected for their ability to be blued, while others are bred and selected to be red, white or pink. The flower color of most other Hydrangea species is not afflicted by aluminum and can't be changed or shifted. Hydrangeas likewise have a nickname called 'Change Rose'.
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Hydrangea Hortensia – brudebukett og bordpynt til bryllup Lie
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