Hydrangea (/ha?'dre?nd?i?/;common labels hydrangea or hortensia) is a genus of 70-75 species of flowering plant life local to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. Undoubtedly the greatest species diversity is in eastern Asia, china notably, Japan, and Korea. Most are shrubs 1 to 3 meters large, but some are small trees and shrubs, yet others lianas reaching up to 30 m (98 foot) by climbing up trees and shrubs. They can be either evergreen or deciduous, though the widely cultivated temperate varieties are all deciduous.Having been introduced to the Azores, H. macrophylla is very common now, on Faial particularly, which is recognized as the "blue island" because of the vast number of hydrangeas present on the island.Life cycleHydrangea bouquets are created from planting season to late fall; they increase in flowerheads (corymbs or panicles) frequently at the ends of the stems.
Typically the flowerheads contain two types of blossoms: small non-showy flowers in the center or interior of the flowerhead, and large, showy blooms with large bright colored sepals (tepals). These showy blossoms are long in a engagement ring often, or to the exterior of the tiny flowers. Plants in wild populations have few to none of the showy blooms typically, while cultivated hydrangeas have been bred and preferred to have more of the bigger type blooms.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 indicates, the relative head of the 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, much like those of some hydrangeas.Soil and colors acidityIn most types the flowers are white, however in some varieties (notably H. macrophylla), can be blue, red, red, light crimson, or dark purple. In these species the color is afflicted by the occurrence of lightweight aluminum ions which are available or tangled up depending upon 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 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 bring about pink or red flowers.
This is caused by a color change of the bloom pigments in the existence of aluminium ions that can be taken up 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 inspired by the cultivar also. Some plants are selected for his or her ability to be blued, while some are bred and selected to be red, white or pink. 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'.
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