Hydrangea (/ha?'dre?nd?i?/;common names 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. Undoubtedly the greatest kinds diversity is eastern Asia, china notably, Japan, and Korea. The majority are shrubs 1 to 3 meters high, however, many are small trees, and more lianas achieving up to 30 m (98 foot) by climbing up trees and shrubs. They could be either evergreen or deciduous, although cultivated temperate varieties are deciduous extensively.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 multitude of hydrangeas present on the island.Life cycleHydrangea bouquets are produced from early spring to late fall months; they increase in flowerheads (corymbs or panicles) most often at the ends of the stems.
Typically the flowerheads contain two types of plants: small non-showy flowers in the center or interior of the flowerhead, and large, showy bouquets with large multi-colored sepals (tepals). These showy blossoms are prolonged in a ring often, or to the surface of the tiny flowers. Plant life in crazy populations have few to nothing of the showy blooms typically, while cultivated hydrangeas have been bred and preferred to have more of the bigger type bouquets.There are two flower arrangements in hydrangeas with Corymb style inflorescens, which include the commonly grown "bigleaf hydrangea"--Hydrangea macrophylla. Mophead bouquets are large spherical flowerheads resembling pom-poms or, as the name indicates, the mind 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 bouquets of some rhododendrons and viburnums can show up, initially, just like those of some hydrangeas.Colors and earth acidityIn most varieties the bouquets are white, however in some kinds (notably H. macrophylla), can be blue, red, pink, light crimson, or dark crimson. In these kinds the colour is damaged by the occurrence of light weight aluminum ions which are available or tangled up depending after the ground 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 produce flowers that are blue to purple typically, 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 bloom pigments in the presence of aluminium ions which may be adopted into hyperaccumulating plants.[6] Decreasing the pH of potting soils or mixes usually will not change the flower color to blue, because these soils have no aluminum ions. The capability to blue or pink a hydrangea is also inspired by the cultivar. Some plants are selected for his or her 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 damaged by aluminum and cannot be changed or shifted. Hydrangeas also have a nickname called 'Change Rose'.