Hydrangea (/ha?'dre?nd?i?/;common titles hydrangea or hortensia) is a genus of 70-75 types of flowering plants native to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. Definitely the greatest varieties diversity is eastern Asia, china notably, Japan, and Korea. Most are shrubs 1 to 3 meters high, but some are small trees and shrubs, and others lianas attaining up to 30 m (98 ft) by climbing up trees. They could be either evergreen or deciduous, though the cultivated temperate kinds are deciduous extensively.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 bouquets are created 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 plants: small non-showy plants in the center or interior of the flowerhead, and large, showy plants with large brilliant sepals (tepals). These showy blooms are expanded in a ring often, or to the exterior of the small flowers. Crops in outdoors populations have few to nothing of the showy bouquets typically, while cultivated hydrangeas have been bred and selected to have significantly more of the larger type bouquets.There are two flower arrangements in hydrangeas with Corymb style inflorescens, which include the commonly grown "bigleaf hydrangea"--Hydrangea macrophylla. Mophead flowers are large round 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 seem, initially, a lot like those of some hydrangeas.Dirt and colors acidityIn most species the flowers are white, however in some types (notably H. macrophylla), can be blue, red, pink, light crimson, or dark purple. In these varieties the color is influenced by the existence of aluminium ions which can be found or tangled 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 result in pink or red flowers.
This is the effect of a color change of the flower pigments in the existence of aluminium ions that can be taken up into hyperaccumulating vegetation.[6] Reducing the pH of potting soils or mixes usually does not change the blossom color to blue, because these soils have no aluminum ions. The ability to blue or green a hydrangea is also influenced by the cultivar. Some plants are selected for his or her ability to be blued, while some are bred and selected to be red, pink or white. The flower color of most other Hydrangea species is not damaged by aluminum and can't be changed or shifted. Hydrangeas likewise have a nickname called 'Change Rose'.
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