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Hydrangea (/ha?'dre?nd?i?/;common names hydrangea or hortensia) is a genus of 70-75 species of flowering plants native to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. Definitely the greatest kinds diversity is within eastern Asia, china notably, Japan, and Korea. Most are shrubs 1 to 3 meters high, but some are small trees and shrubs, and others lianas reaching up to 30 m (98 foot) by climbing up trees. They can be either evergreen or deciduous, though the broadly cultivated temperate species are all deciduous.Having been introduced to the Azores, H. macrophylla is quite typical now, on Faial particularly, which is known as the "blue island" because of the multitude of hydrangeas present on the island.Life cycleHydrangea blossoms are created 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 bouquets: small non-showy flowers in the center or interior of the flowerhead, and large, showy blossoms with large vibrant sepals (tepals). These showy plants are often prolonged in a band, or to the surface of the small flowers. Crops in crazy populations have few to nothing of the showy blossoms typically, while cultivated hydrangeas have been picked and bred to have more of the larger type blossoms.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 means, the head of the mop. On the other hand, lacecap flowers bear round, flat flowerheads with a center core of subdued, small blossoms ornamented by outer jewelry of bigger blossoms having showy tepals or sepals.

The plants of some viburnums and rhododendrons can appear, at first glance, comparable to those of some hydrangeas.Garden soil and colors acidityIn most species the bouquets are white, but in some varieties (notably H. macrophylla), can be blue, red, red, light purple, or dark purple. In these kinds the colour is influenced by the occurrence of aluminium ions which can be found or tied up depending after the garden soil pH. For H. h and macrophylla. 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 lead to pink or red flowers.

This is the effect of a color change of the flower pigments in the occurrence of aluminium ions which is often adopted into hyperaccumulating plants.[6] Reducing the pH of potting soils or mixes usually does not change the flower color to blue, because these soils haven't any aluminum ions. The ability to blue or green 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 influenced by aluminum and cannot be changed or shifted. Hydrangeas likewise have a nickname called 'Change Rose'.