Hydrangea (/ha?'dre?nd?i?/;common brands hydrangea or hortensia) is a genus of 70-75 types of flowering plants indigenous to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. Undoubtedly the greatest varieties diversity is within eastern Asia, notably China, Japan, and Korea. Most are shrubs 1 to 3 meters tall, but some are small trees and shrubs, while others lianas getting up to 30 m (98 foot) by climbing up trees. They can be either evergreen or deciduous, although cultivated temperate varieties are deciduous greatly.Having been introduced to the Azores, H. macrophylla is now very common, particularly on Faial, which is recognized as the "blue island" due to the multitude of hydrangeas present on the island.Life cycleHydrangea plants are produced from planting season to late fall; they expand in flowerheads (corymbs or panicles) most often at the ends of the stems.
Typically the flowerheads contain two types of blooms: small non-showy bouquets in the center or interior of the flowerhead, and large, showy blooms with large colourful sepals (tepals). These showy plants tend to be long in a engagement ring, or to the exterior of the small flowers. Vegetation in outdoors populations have few to nothing of the showy plants typically, while cultivated hydrangeas have been determined and bred to have significantly more of the larger type plants.There are two flower arrangements in hydrangeas with Corymb style inflorescens, which includes the commonly grown "bigleaf hydrangea"--Hydrangea macrophylla. Mophead plants are large circular flowerheads resembling pom-poms or, as the name signifies, the brain of an mop. In contrast, lacecap flowers bear round, flat flowerheads with a center core of subdued, small flowers surrounded by outer jewelry of greater flowers having showy tepals or sepals.
The bouquets of some viburnums and rhododendrons can show up, at first glance, very much like those of some hydrangeas.Colors and land acidityIn most species the blooms are white, but in some types (notably H. macrophylla), can be blue, red, red, light purple, or dark crimson. In these types the colour is damaged by the occurrence of aluminum ions which can be found or tied up depending after the soil pH. For H. h and macrophylla. serrata cultivars, the flower color can be determined by 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 lead to pink or red flowers.
This is caused by a color change of the blossom pigments in the occurrence of aluminium ions which is often adopted into hyperaccumulating plant life.[6] Cutting down the pH of potting soils or mixes usually will not change the flower color to blue, because these soils haven't any aluminum ions. The ability to blue or green a hydrangea is inspired by the cultivar also. Some plants are selected because of their ability to be blued, while others 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 likewise have a nickname called 'Change Rose'.
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