Hydrangea (/ha?'dre?nd?i?/;common labels hydrangea or hortensia) is a genus of 70-75 kinds of flowering crops local to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. Undoubtedly the greatest varieties diversity is at eastern Asia, notably China, Japan, and Korea. Most are shrubs 1 to 3 meters large, however, many are small trees and shrubs, among others lianas getting up to 30 m (98 foot) by climbing up trees. They can be either evergreen or deciduous, though the cultivated temperate varieties are deciduous widely.Having been introduced to the Azores, H. macrophylla is very common now, on Faial particularly, which is known as the "blue island" due to the multitude of hydrangeas present on the island.Life cycleHydrangea plants are created from planting season to late fall months; they grow in flowerheads (corymbs or panicles) frequently at the ends of the stems.
Usually 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 multi-colored sepals (tepals). These showy plants are prolonged in a diamond ring often, or to the exterior of the small flowers. Vegetation in crazy populations have few to nothing of the showy blossoms typically, while cultivated hydrangeas have been chosen and bred 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 flowers are large circular flowerheads resembling pom-poms or, as the name implies, the head of a mop. In contrast, lacecap flowers bear round, flat flowerheads with a center core of subdued, small flowers bounded by outer wedding rings of much larger flowers having showy tepals or sepals.
The flowers of some viburnums and rhododendrons can seem, at first glance, much like those of some hydrangeas.Colors and soil acidityIn most species the plants are white, but in some kinds (notably H. macrophylla), can be blue, red, pink, light purple, or dark crimson. In these types the color is afflicted by the existence of light weight aluminum ions which are available or tangled up depending upon the land pH. For H. macrophylla and H. serrata cultivars, the flower color can be dependant on 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 bloom pigments in the existence of aluminium ions that can be taken up into hyperaccumulating plant life.[6] Reducing the pH of potting soils or mixes usually will not change the flower color to blue, because these soils have no aluminum ions. The capability to blue or pink a hydrangea is also affected by the cultivar. Some plants are selected for their ability to be blued, while some are bred and selected to be red, pink or white. The flower color of most other Hydrangea species is not affected by aluminum and cannot be changed or shifted. Hydrangeas likewise have a nickname called 'Change Rose'.
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