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Hydrangea (/ha?'dre?nd?i?/;common labels hydrangea or hortensia) is a genus of 70-75 varieties of flowering vegetation local to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. Certainly the greatest types diversity is in eastern Asia, china notably, Japan, and Korea. The majority are shrubs 1 to 3 meters large, however, many are small trees and shrubs, and more lianas achieving up to 30 m (98 foot) by climbing up trees and shrubs. They could be either deciduous or evergreen, though the cultivated temperate species are deciduous broadly.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 blooms are produced from early spring to late fall months; they expand in flowerheads (corymbs or panicles) frequently at the ends of the stems.

Typically the flowerheads contain two types of flowers: small non-showy blossoms in the center or interior of the flowerhead, and large, showy bouquets with large vibrant sepals (tepals). These showy blooms tend to be prolonged in a diamond ring, or to the exterior of the small flowers. Plant life in wild populations routinely have few to none of the showy blossoms, while cultivated hydrangeas have been chosen and bred to have significantly 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 bouquets are large circular flowerheads resembling pom-poms or, as the name signifies, the brain of an mop. On the other hand, lacecap flowers bear round, flat flowerheads with a center core of subdued, small plants encircled by outer rings of bigger plants having showy tepals or sepals.

The bouquets of some rhododendrons and viburnums can show up, initially, a lot like those of some hydrangeas.Colors and ground acidityIn most kinds the plants are white, but in some species (notably H. macrophylla), can be blue, red, pink, light crimson, or dark crimson. In these types the colour is afflicted by the presence of metal ions which can be found or tied up depending after the ground 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 flower pigments in the presence of aluminium ions which is often taken up into hyperaccumulating crops.[6] Cutting down the pH of potting soils or mixes usually will not change the blossom color to blue, because these soils have no aluminum ions. The ability to blue or green a hydrangea is inspired by the cultivar also. Some plants are selected for his or her 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 also have a nickname called 'Change Rose'.