Hydrangea (/ha?'dre?nd?i?/;common titles hydrangea or hortensia) is a genus of 70-75 varieties of flowering crops native to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. By far the greatest species diversity is within eastern Asia, notably China, Japan, and Korea. Most are shrubs 1 to 3 meters high, however, many are small trees, yet others lianas getting up to 30 m (98 ft) by climbing up trees. They can be either deciduous or evergreen, although cultivated temperate varieties are all deciduous widely.Having been introduced to the Azores, H. macrophylla is quite typical now, on Faial particularly, which is known as the "blue island" because of the multitude of hydrangeas present on the island.Life cycleHydrangea blossoms are produced from planting season to late autumn; 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 plants in the guts or interior of the flowerhead, and large, showy bouquets with large brilliant sepals (tepals). These showy bouquets are extended in a ring often, or to the surface of the small flowers. Vegetation in outrageous populations routinely have few to none of them of the showy blooms, while cultivated hydrangeas have been bred and determined to have more of the bigger type blooms.There are two flower arrangements in hydrangeas with Corymb style inflorescens, which includes the commonly grown "bigleaf hydrangea"--Hydrangea macrophylla. Mophead blooms are large circular flowerheads resembling pom-poms or, as the name signifies, the comparative mind of a mop. On the other hand, lacecap flowers bear round, flat flowerheads with a center core of subdued, small flowers surrounded by outer rings of larger flowers having showy sepals or tepals.
The blossoms of some rhododendrons and viburnums can seem, initially, comparable to those of some hydrangeas.Colors and soil acidityIn most varieties the flowers are white, but in some species (notably H. macrophylla), can be blue, red, red, light purple, or dark purple. In these species the colour is afflicted by the existence of metal ions which can be found or tied up depending after the ground 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 bring about pink or red flowers.
This is caused by a color change of the flower pigments in the occurrence of aluminium ions which may be taken up into hyperaccumulating plants.[6] Decreasing the pH of potting soils or mixes usually will not change the blossom color to blue, because these soils have no aluminum ions. The capability to blue or pink a hydrangea is inspired 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 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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