Hydrangea (/ha?'dre?nd?i?/;common names hydrangea or hortensia) is a genus of 70-75 kinds of flowering vegetation indigenous to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. By far the greatest varieties diversity is eastern Asia, china notably, Japan, and Korea. The majority are shrubs 1 to 3 meters tall, however, many are small trees and shrubs, as well as others lianas reaching up to 30 m (98 feet) by climbing up trees and shrubs. They can be either deciduous or evergreen, although widely cultivated temperate varieties are deciduous.Having been introduced to the Azores, H. macrophylla is very common now, particularly on Faial, which is known as the "blue island" due to the vast number of hydrangeas present on the island.Life cycleHydrangea blossoms are produced from planting season to late fall; they increase in flowerheads (corymbs or panicles) frequently at the ends of the stems.
Usually the flowerheads contain two types of flowers: small non-showy blooms in the guts or interior of the flowerhead, and large, showy blossoms with large bright colored sepals (tepals). These showy flowers tend to be extended in a band, or to the exterior of the tiny flowers. Plants in crazy populations have few to none of the showy blossoms typically, while cultivated hydrangeas have been bred and decided on to have significantly more of the bigger type plants.There are two flower arrangements in hydrangeas with Corymb style inflorescens, which include the commonly grown "bigleaf hydrangea"--Hydrangea macrophylla. Mophead bouquets are large round flowerheads resembling pom-poms or, as the name implies, the comparative brain of a mop. On the other hand, 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 look, initially, just like those of some hydrangeas.Colors and ground acidityIn most kinds the blooms are white, but in some types (notably H. macrophylla), can be blue, red, green, light crimson, or dark purple. In these species the color is influenced by the occurrence of aluminium ions which can be found or tangled up depending after the soil 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 lead to pink or red flowers.
This is caused by a color change of the bloom pigments in the occurrence of aluminium ions which may be adopted into hyperaccumulating crops.[6] Minimizing the pH of potting soils or mixes usually does not change the blossom color to blue, because these soils have no aluminum ions. The capability to blue or pink a hydrangea is inspired by the cultivar also. Some plants are selected for their ability to be blued, while some are bred and selected to be red, white or pink. The flower color of all other Hydrangea species is not damaged by aluminum and cannot be changed or shifted. Hydrangeas also have a nickname called 'Change Rose'.
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