Hydrangea (/ha?'dre?nd?i?/;common brands hydrangea or hortensia) is a genus of 70-75 types of flowering crops native to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. Certainly the greatest species diversity is within eastern Asia, china notably, Japan, and Korea. The majority are shrubs 1 to 3 meters high, but some are small trees, and others lianas reaching up to 30 m (98 ft) by climbing up trees. They can be either evergreen or deciduous, although greatly cultivated temperate kinds are deciduous.Having been introduced to the Azores, H. macrophylla is currently very common, on Faial particularly, which is recognized as the "blue island" due to the multitude of hydrangeas present on the island.Life cycleHydrangea blooms are created from planting season to late autumn; they grow in flowerheads (corymbs or panicles) frequently at the ends of the stems.
Usually the flowerheads contain two types of blooms: small non-showy blossoms in the guts or interior of the flowerhead, and large, showy blossoms with large bright colored sepals (tepals). These showy blossoms are extended in a ring often, or to the surface of the tiny flowers. Plants in wild populations typically have few to none of the showy plants, while cultivated hydrangeas have been determined and bred 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 bouquets are large rounded flowerheads resembling pom-poms or, as the name indicates, the comparative mind of your 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 flowers of some rhododendrons and viburnums can show up, initially, very much like those of some hydrangeas.Colors and ground acidityIn most varieties the blooms are white, however in some types (notably H. macrophylla), can be blue, red, red, light purple, or dark purple. In these types the color is affected by the presence of aluminum ions which can be found or tangled up depending upon the dirt pH. For H. h and macrophylla. 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 caused by a color change of the flower pigments in the presence of aluminium ions which is often adopted into hyperaccumulating vegetation.[6] Minimizing the pH of potting soils or mixes usually does not change the bloom 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 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 afflicted by aluminum and can't be changed or shifted. Hydrangeas also have a nickname called 'Change Rose'.
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