Hydrangea (/ha?'dre?nd?i?/;common titles hydrangea or hortensia) is a genus of 70-75 varieties of flowering vegetation native to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. Certainly the greatest kinds diversity is within eastern Asia, china notably, Japan, and Korea. The majority are shrubs 1 to 3 meters tall, however, many are small trees, while others lianas getting up to 30 m (98 foot) by climbing up trees. They could be either deciduous or evergreen, though the generally cultivated temperate species are deciduous.Having been introduced to the Azores, H. macrophylla is very common now, particularly on Faial, which is known as the "blue island" because of the multitude of hydrangeas present on the island.Life cycleHydrangea plants are produced from planting season to late fall months; they grow in flowerheads (corymbs or panicles) frequently 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 plants with large colorful sepals (tepals). These showy blossoms are often long in a wedding ring, or to the surface of the small flowers. Plant life in untamed populations routinely have few to nothing of the showy blossoms, while cultivated hydrangeas have been bred and determined to have 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 flowers are large circular flowerheads resembling pom-poms or, as the name means, the 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 bouquets of some viburnums and rhododendrons can seem, at first glance, very much like those of some hydrangeas.Land and colors acidityIn most species the bouquets are white, but in some types (notably H. macrophylla), can be blue, red, red, light crimson, or dark crimson. In these types the color is influenced by the occurrence of metal ions which are available or tangled up depending upon 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 have available 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 caused by a color change of the rose pigments in the occurrence of aluminium ions which can be adopted into hyperaccumulating vegetation.[6] Decreasing the pH of potting soils or mixes usually will not change the rose color to blue, because these soils have no aluminum ions. The capability to blue or green a hydrangea is also influenced by the cultivar. Some plants are selected for their ability to be blued, while others 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 likewise have a nickname called 'Change Rose'.
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