Hydrangea (/ha?'dre?nd?i?/;common titles hydrangea or hortensia) is a genus of 70-75 species of flowering plant life indigenous to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. Probably the greatest species 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 others lianas getting up to 30 m (98 feet) by climbing up trees and shrubs. They can be either deciduous or evergreen, though the cultivated temperate varieties are all deciduous broadly.Having been introduced to the Azores, H. macrophylla is now very common, particularly on Faial, which is recognized as the "blue island" due to the vast number of hydrangeas present on the island.Life cycleHydrangea bouquets are produced from planting season to late fall; they increase in flowerheads (corymbs or panicles) most often at the ends of the stems.
Usually the flowerheads contain two types of plants: small non-showy blossoms in the center or interior of the flowerhead, and large, showy flowers with large bright colored sepals (tepals). These showy flowers tend to be expanded in a ring, or to the surface of the tiny flowers. Crops in untamed populations have few to none of them of the showy bouquets typically, while cultivated hydrangeas have been bred and preferred to have more of the bigger type plants.There are two flower arrangements in hydrangeas with Corymb style inflorescens, which includes the commonly grown "bigleaf hydrangea"--Hydrangea macrophylla. Mophead bouquets are large spherical flowerheads resembling pom-poms or, as the name indicates, the comparative mind of an mop. On the other hand, lacecap flowers bear round, flat flowerheads with a center core of subdued, small flowers surrounded by outer jewelry of larger flowers having showy tepals or sepals.
The blossoms of some rhododendrons and viburnums can show up, initially, just like those of some hydrangeas.Garden soil and colors acidityIn most kinds the plants are white, however in some species (notably H. macrophylla), can be blue, red, red, light purple, or dark purple. In these types the color is affected by the presence of light weight aluminum ions which can be found 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 cause pink or red flowers.
This is caused by a color change of the bloom pigments in the presence of aluminium ions that can be adopted into hyperaccumulating plants.[6] Minimizing 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 green a hydrangea is also influenced by the cultivar. 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 afflicted by aluminum and cannot be changed or shifted. Hydrangeas also have a nickname called 'Change Rose'.
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