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. By far the greatest species diversity is eastern Asia, china notably, Japan, and Korea. Most are shrubs 1 to 3 meters extra tall, however, many are small trees, while others lianas attaining up to 30 m (98 foot) by climbing up trees and shrubs. They can be either deciduous or evergreen, although extensively cultivated temperate species are deciduous.Having been introduced to the Azores, H. macrophylla is quite typical now, particularly on Faial, which is known as the "blue island" due to the multitude of hydrangeas present on the island.Life cycleHydrangea bouquets are produced from early spring to late fall months; they grow in flowerheads (corymbs or panicles) most often at the ends of the stems.
Usually the flowerheads contain two types of blooms: small non-showy bouquets in the center or interior of the flowerhead, and large, showy bouquets with large vibrant sepals (tepals). These showy plants are often prolonged in a engagement ring, or to the exterior of the tiny flowers. Vegetation in untamed populations typically have few to nothing of the showy blossoms, while cultivated hydrangeas have been bred and determined to have more of the larger type blooms.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 means, the relative mind of the mop. In contrast, 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 appear, initially, just like those of some hydrangeas.Colors and ground acidityIn most types the blossoms are white, however in some species (notably H. macrophylla), can be blue, red, red, light crimson, or dark crimson. In these varieties the color is damaged by the presence of lightweight aluminum ions which are available or tangled up depending after the dirt 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 produce flowers that are blue to purple typically, whereas an alkaline soil (pH above 7) will tie up aluminum ions and cause pink or red flowers.
This is the effect of a color change of the rose pigments in the existence of aluminium ions which may be adopted into hyperaccumulating plants.[6] Cutting down 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 green a hydrangea is inspired by the cultivar also. Some plants are selected for his or her 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 affected by aluminum and can't be changed or shifted. Hydrangeas also have a nickname called 'Change Rose'.
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