Hydrangea (/ha?'dre?nd?i?/;common titles hydrangea or hortensia) is a genus of 70-75 varieties of flowering plant life local to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. Probably the greatest species diversity is within eastern Asia, notably China, Japan, and Korea. The majority are shrubs 1 to 3 meters tall, however, many are small trees, while others lianas achieving up to 30 m (98 ft) by climbing up trees. They can be either evergreen or deciduous, though the cultivated temperate types are deciduous broadly.Having been introduced to the Azores, H. macrophylla is very common now, particularly on Faial, which is recognized as the "blue island" because of the vast number of hydrangeas present on the island.Life cycleHydrangea plants are produced from early spring to late fall; they increase in flowerheads (corymbs or panicles) most often at the ends of the stems.
Usually the flowerheads contain two types of plants: small non-showy plants in the center or interior of the flowerhead, and large, showy flowers with large colorful sepals (tepals). These showy flowers are prolonged in a engagement ring often, or to the exterior of the tiny flowers. Plants in untamed populations have few to none of the showy plants typically, while cultivated hydrangeas have been selected and bred to have significantly more of the bigger 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 rounded flowerheads resembling pom-poms or, as the name implies, the comparative 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 plants of some viburnums and rhododendrons can show up, at first glance, a lot like those of some hydrangeas.Land and colors acidityIn most types the flowers are white, but in some kinds (notably H. macrophylla), can be blue, red, pink, light purple, or dark purple. In these species the color is affected by the existence of aluminum ions which are available or tied up depending after the earth 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 cause pink or red flowers.
This is the effect of a color change of the bloom pigments in the occurrence of aluminium ions which is often adopted into hyperaccumulating crops.[6] Minimizing the pH of potting soils or mixes usually does not change the blossom color to blue, because these soils haven't any aluminum ions. The capability to blue or pink 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 afflicted by aluminum and cannot be changed or shifted. Hydrangeas likewise have a nickname called 'Change Rose'.
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