Hydrangea (/ha?'dre?nd?i?/;common brands hydrangea or hortensia) is a genus of 70-75 species of flowering vegetation local to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. Certainly the greatest species diversity is in eastern Asia, notably China, Japan, and Korea. The majority are shrubs 1 to 3 meters large, however, many are small trees and shrubs, and more lianas reaching up to 30 m (98 feet) by climbing up trees and shrubs. They can be either evergreen or deciduous, although cultivated temperate types are deciduous broadly.Having been introduced to the Azores, H. macrophylla is currently very common, on Faial particularly, which is known as the "blue island" because of the vast number of hydrangeas present on the island.Life cycleHydrangea bouquets are produced from early spring to late fall months; they expand in flowerheads (corymbs or panicles) most often at the ends of the stems.
Usually the flowerheads contain two types of plants: small non-showy flowers in the center or interior of the flowerhead, and large, showy blooms with large multi-colored sepals (tepals). These showy plants are extended in a band often, or to the exterior of the tiny flowers. Plant life in wild populations typically have few to none of the showy blossoms, while cultivated hydrangeas have been chosen and bred to have more of the larger type blooms.There are two flower arrangements in hydrangeas with Corymb style inflorescens, which includes the commonly grown "bigleaf hydrangea"--Hydrangea macrophylla. Mophead flowers are large round flowerheads resembling pom-poms or, as the name suggests, the relative mind of an 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 blooms of some viburnums and rhododendrons can show up, at first glance, a lot like those of some hydrangeas.Colors and dirt acidityIn most varieties the blooms are white, however in some species (notably H. macrophylla), can be blue, red, red, light purple, or dark purple. In these kinds the colour is afflicted by the presence of lightweight aluminum ions which are available or tied up depending after the soil 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 have available aluminum ions and typically produce flowers that are blue to purple, whereas an alkaline soil (pH above 7) will tie up aluminum ions and result in pink or red flowers.
This is the effect of a color change of the bloom pigments in the existence of aluminium ions that can be adopted into hyperaccumulating vegetation.[6] Bringing down the pH of potting soils or mixes usually will not change the bloom color to blue, because these soils have no aluminum ions. The ability to blue or pink a hydrangea is affected 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 most other Hydrangea species is not damaged by aluminum and can't be changed or shifted. Hydrangeas also have a nickname called 'Change Rose'.
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