Hydrangea (/ha?'dre?nd?i?/;common titles hydrangea or hortensia) is a genus of 70-75 kinds of flowering plants local to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. By far the greatest species diversity is in eastern Asia, china notably, Japan, and Korea. Most are shrubs 1 to 3 meters tall, but some are small trees and shrubs, and others lianas achieving up to 30 m (98 foot) by climbing up trees. They can be either evergreen or deciduous, although widely cultivated temperate kinds are all deciduous.Having been introduced to the Azores, H. macrophylla is very common now, on Faial particularly, which is known as the "blue island" due to the vast number of hydrangeas present on the island.Life cycleHydrangea blooms are produced from planting season to late autumn; they expand in flowerheads (corymbs or panicles) most often at the ends of the stems.
Typically the flowerheads contain two types of flowers: small non-showy bouquets in the guts or interior of the flowerhead, and large, showy blooms with large vibrant sepals (tepals). These showy bouquets are often expanded in a band, or to the exterior of the tiny flowers. Plants in crazy populations routinely have few to nothing of the showy plants, while cultivated hydrangeas have been preferred and bred to have 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 circular flowerheads resembling pom-poms or, as the name indicates, the head 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 look, at first glance, a lot like those of some hydrangeas.Colors and soil acidityIn most varieties the blossoms are white, however in some types (notably H. macrophylla), can be blue, red, green, light purple, or dark crimson. In these kinds the color is damaged by the occurrence of aluminum ions which can be found or tangled up depending upon the dirt 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 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 that can be adopted into hyperaccumulating plant life.[6] Decreasing the pH of potting soils or mixes usually does not change the rose color to blue, because these soils have no aluminum ions. The ability to blue or green a hydrangea is also influenced by the cultivar. Some plants are selected for their ability to be blued, while others are bred and selected to be red, pink or white. The flower color of most other Hydrangea species is not influenced by aluminum and can't be changed or shifted. Hydrangeas likewise have a nickname called 'Change Rose'.
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