Hydrangea (/ha?'dre?nd?i?/;common brands hydrangea or hortensia) is a genus of 70-75 varieties of flowering plants local to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. Certainly the greatest species diversity is eastern Asia, notably China, Japan, and Korea. The majority are shrubs 1 to 3 meters large, however, many are small trees and shrubs, and others lianas reaching up to 30 m (98 foot) by climbing up trees. They could be either evergreen or deciduous, although extensively cultivated temperate kinds are deciduous.Having been introduced to the Azores, H. macrophylla is currently very common, particularly on Faial, which is known as the "blue island" because of the vast number of hydrangeas present on the island.Life cycleHydrangea flowers are created from planting season to late fall; they develop in flowerheads (corymbs or panicles) frequently at the ends of the stems.
Typically the flowerheads contain two types of bouquets: small non-showy blossoms in the center or interior of the flowerhead, and large, showy flowers with large brilliant sepals (tepals). These showy plants are long in a ring often, or to the exterior of the small flowers. Plants in outrageous populations have few to none of them of the showy plants typically, while cultivated hydrangeas have been bred and selected to have more of the bigger 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 rounded flowerheads resembling pom-poms or, as the name signifies, the relative head 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 blooms of some viburnums and rhododendrons can seem, at first glance, a lot like those of some hydrangeas.Colors and land acidityIn most species the plants are white, however in some species (notably H. macrophylla), can be blue, red, green, light crimson, or dark purple. In these species the colour is affected by the presence of lightweight aluminum ions which can be found or tangled up depending after the dirt 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 the effect of a color change of the blossom pigments in the existence of aluminium ions which can be adopted into hyperaccumulating crops.[6] Minimizing the pH of potting soils or mixes usually will not change the bloom color to blue, because these soils have no aluminum ions. The ability to blue or green a hydrangea is also affected by the cultivar. Some plants are selected because of their 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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