Hydrangea (/ha?'dre?nd?i?/;common titles hydrangea or hortensia) is a genus of 70-75 types of flowering vegetation indigenous to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. Undoubtedly 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, yet others lianas achieving up to 30 m (98 ft) by climbing up trees. They could be either evergreen or deciduous, although generally cultivated temperate kinds are deciduous.Having been introduced to the Azores, H. macrophylla is currently very common, on Faial particularly, which is recognized as the "blue island" because of the multitude of hydrangeas present on the island.Life cycleHydrangea bouquets are created from planting season to late fall; they grow in flowerheads (corymbs or panicles) most often at the ends of the stems.
Typically the flowerheads contain two types of bouquets: small non-showy flowers in the guts or interior of the flowerhead, and large, showy blooms with large colourful sepals (tepals). These showy bouquets tend to be prolonged in a diamond ring, or to the surface of the small flowers. Crops in outrageous populations have few to none of them of the showy blossoms typically, while cultivated hydrangeas have been bred and selected to have more of the bigger type bouquets.There are two flower arrangements in hydrangeas with Corymb style inflorescens, which includes the commonly grown "bigleaf hydrangea"--Hydrangea macrophylla. Mophead blooms are large round flowerheads resembling pom-poms or, as the name implies, the brain 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 look, initially, much like those of some hydrangeas.Colors and ground acidityIn most types the bouquets are white, but in some types (notably H. macrophylla), can be blue, red, green, light purple, or dark crimson. In these varieties the colour is influenced by the occurrence of metal ions which can be found or tangled up depending upon the land 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 cause pink or red flowers.
This is the effect of a color change of the blossom pigments in the presence of aluminium ions that can be taken up into hyperaccumulating plant life.[6] Lowering the pH of potting soils or mixes usually will not change the blossom color to blue, because these soils haven't any aluminum ions. The ability to blue or pink a hydrangea is affected by the cultivar also. Some plants are selected because of their 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 damaged by aluminum and can't be changed or shifted. Hydrangeas also have a nickname called 'Change Rose'.
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