Hydrangea (/ha?'dre?nd?i?/;common names hydrangea or hortensia) is a genus of 70-75 types of flowering crops local to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. Certainly the greatest varieties diversity is within eastern Asia, notably China, Japan, and Korea. Most are shrubs 1 to 3 meters tall, however, many are small trees, among others lianas reaching up to 30 m (98 foot) by climbing up trees and shrubs. They can be either deciduous or evergreen, though the greatly cultivated temperate types are deciduous.Having been introduced to the Azores, H. macrophylla is now very common, on Faial particularly, which is recognized as the "blue island" because of the vast number of hydrangeas present on the island.Life cycleHydrangea flowers are produced from early spring to late autumn; they expand in flowerheads (corymbs or panicles) most often at the ends of the stems.
Usually the flowerheads contain two types of bouquets: small non-showy blossoms in the center or interior of the flowerhead, and large, showy plants with large vibrant sepals (tepals). These showy blossoms are prolonged in a wedding ring often, or to the surface of the tiny flowers. Plants in outdoors populations have few to nothing of the showy bouquets typically, while cultivated hydrangeas have been bred and picked to have significantly more of the larger type blossoms.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 means, the relative mind of an mop. In contrast, 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 plants of some viburnums and rhododendrons can show up, initially, similar to those of some hydrangeas.Land and colors acidityIn most species the plants are white, however in some species (notably H. macrophylla), can be blue, red, green, light crimson, or dark crimson. In these varieties the color is damaged by the occurrence of light weight aluminum ions which can be found or tangled up depending after the ground 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 bring about pink or red flowers.
This is the effect of a color change of the blossom pigments in the occurrence of aluminium ions which is often taken up into hyperaccumulating crops.[6] Reducing the pH of potting soils or mixes usually does not change the bloom color to blue, because these soils have no aluminum ions. The ability to blue or green a hydrangea is affected by the cultivar also. Some plants are selected for their ability to be blued, while some 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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