Hydrangea (/ha?'dre?nd?i?/;common titles hydrangea or hortensia) is a genus of 70-75 kinds of flowering crops native to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. Probably the greatest kinds diversity is at eastern Asia, china notably, Japan, and Korea. Most are shrubs 1 to 3 meters extra tall, however, many are small trees, and more lianas attaining up to 30 m (98 foot) by climbing up trees. They could be either deciduous or evergreen, though the cultivated temperate species are deciduous widely.Having been introduced to the Azores, H. macrophylla is currently very common, particularly on Faial, which is known as the "blue island" due to the multitude of hydrangeas present on the island.Life cycleHydrangea blooms are created from planting season to late fall; they grow 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 plants with large vibrant sepals (tepals). These showy bouquets are expanded in a wedding ring often, or to the exterior of the small flowers. Plant life in untamed populations have few to none of them of the showy bouquets typically, while cultivated hydrangeas have been bred and picked to have significantly more of the larger type flowers.There are two flower arrangements in hydrangeas with Corymb style inflorescens, which includes the commonly grown "bigleaf hydrangea"--Hydrangea macrophylla. Mophead bouquets are large circular flowerheads resembling pom-poms or, as the name means, the relative head of any 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 flowers of some rhododendrons and viburnums can seem, at first glance, very much like those of some hydrangeas.Earth and colors acidityIn most species the flowers are white, however in some varieties (notably H. macrophylla), can be blue, red, red, light purple, or dark purple. In these types the color is influenced by the existence of lightweight aluminum ions which are available or tied up depending after 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 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 the effect of a color change of the blossom pigments in the presence of aluminium ions which can be taken up into hyperaccumulating plant life.[6] Bringing down the pH of potting soils or mixes usually does not change the blossom color to blue, because these soils haven't any aluminum ions. The ability to blue or pink a hydrangea is affected 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 all other Hydrangea species is not afflicted by aluminum and can't be changed or shifted. Hydrangeas also have a nickname called 'Change Rose'.
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