Hydrangea (/ha?'dre?nd?i?/;common titles hydrangea or hortensia) is a genus of 70-75 species of flowering crops local to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. Certainly the greatest kinds diversity is at eastern Asia, notably China, Japan, and Korea. Most are shrubs 1 to 3 meters tall, but some are small trees and shrubs, while others lianas achieving up to 30 m (98 feet) by climbing up trees and shrubs. They could be either deciduous or evergreen, though the generally cultivated temperate kinds are deciduous.Having been introduced to the Azores, H. macrophylla is currently very common, particularly on Faial, which is known as the "blue island" because of 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.
Typically the flowerheads contain two types of bouquets: small non-showy bouquets in the center or interior of the flowerhead, and large, showy bouquets with large multi-colored sepals (tepals). These showy flowers are often prolonged in a diamond ring, or to the surface of the tiny flowers. Plants in outrageous populations routinely have few to none of them of the showy plants, while cultivated hydrangeas have been bred and preferred to have significantly more of the larger type plants.There are two flower arrangements in hydrangeas with Corymb style inflorescens, which includes the commonly grown "bigleaf hydrangea"--Hydrangea macrophylla. Mophead blooms are large round flowerheads resembling pom-poms or, as the name suggests, the relative head of your mop. In contrast, lacecap flowers bear round, flat flowerheads with a center core of subdued, small flowers encircled by outer rings of much larger bouquets having showy tepals or sepals.
The bouquets of some rhododendrons and viburnums can show up, at first glance, very much like those of some hydrangeas.Land and colors acidityIn most types the flowers are white, but in some varieties (notably H. macrophylla), can be blue, red, red, light purple, or dark crimson. In these species the color is influenced by the presence of aluminium ions which can be found or tied up depending after the dirt 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 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 blossom pigments in the occurrence of aluminium ions that can be taken up into hyperaccumulating plant life.[6] Lowering the pH of potting soils or mixes usually does not change the flower color to blue, because these soils have no aluminum ions. The ability to blue or pink a hydrangea is influenced by the cultivar also. Some plants are selected because of their ability to be blued, while others are bred and selected to be red, white or pink. The flower color of all other Hydrangea species is not affected by aluminum and can't be changed or shifted. Hydrangeas likewise have a nickname called 'Change Rose'.
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