Hydrangea (/ha?'dre?nd?i?/;common labels hydrangea or hortensia) is a genus of 70-75 kinds of flowering plant life indigenous to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. Probably the greatest types diversity is eastern Asia, china notably, Japan, and Korea. Most are shrubs 1 to 3 meters tall, however, many are small trees and shrubs, while others lianas attaining up to 30 m (98 feet) by climbing up trees. They could be either evergreen or deciduous, though the widely cultivated temperate varieties are all deciduous.Having been introduced to the Azores, H. macrophylla is now very common, particularly on Faial, which is known as the "blue island" due to the vast number of hydrangeas present on the island.Life cycleHydrangea flowers are created from planting season to late autumn; they expand in flowerheads (corymbs or panicles) most often at the ends of the stems.
Typically the flowerheads contain two types of bouquets: small non-showy bouquets in the guts or interior of the flowerhead, and large, showy blooms with large brilliant sepals (tepals). These showy blossoms are often lengthened in a diamond ring, or to the surface of the small flowers. Plants in wild populations have few to nothing of the showy blooms typically, while cultivated hydrangeas have been bred and determined to have significantly more of the larger type flowers.There are two flower arrangements in hydrangeas with Corymb style inflorescens, which include the commonly grown "bigleaf hydrangea"--Hydrangea macrophylla. Mophead blooms are large rounded flowerheads resembling pom-poms or, as the name signifies, the 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 appear, at first glance, much like those of some hydrangeas.Colors and garden soil acidityIn most kinds the plants are white, however in some kinds (notably H. macrophylla), can be blue, red, green, light purple, or dark crimson. In these types the colour is affected by the presence of aluminium ions which can be found or tied 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 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 result in pink or red flowers.
This is the effect of a color change of the bloom pigments in the occurrence of aluminium ions which may be adopted into hyperaccumulating plant life.[6] Minimizing 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 also inspired by the cultivar. 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 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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