Hydrangea (/ha?'dre?nd?i?/;common labels hydrangea or hortensia) is a genus of 70-75 kinds of flowering plant life local to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. By far the greatest kinds diversity is eastern Asia, china notably, Japan, and Korea. The majority are shrubs 1 to 3 meters high, however, many are small trees, among others lianas reaching up to 30 m (98 ft) by climbing up trees. They can be either deciduous or evergreen, though the greatly cultivated temperate kinds are all 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 vast number 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 blooms: small non-showy blossoms in the center or interior of the flowerhead, and large, showy blooms with large bright colored sepals (tepals). These showy blooms are prolonged in a wedding ring often, or to the surface of the tiny flowers. Plants in outdoors populations have few to none of them of the showy plants typically, while cultivated hydrangeas have been preferred and bred to have significantly more of the larger type blooms.There are two flower arrangements in hydrangeas with Corymb style inflorescens, which includes the commonly grown "bigleaf hydrangea"--Hydrangea macrophylla. Mophead blooms are large spherical flowerheads resembling pom-poms or, as the name indicates, the brain of any 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 rhododendrons and viburnums can appear, initially, comparable to those of some hydrangeas.Colors and ground acidityIn most kinds the bouquets are white, however in some varieties (notably H. macrophylla), can be blue, red, pink, light purple, or dark crimson. In these varieties the color is affected by the presence of metal ions which are available or tied up depending after the garden soil pH. For H. h and macrophylla. serrata cultivars, the flower color can be dependant on the relative acidity of the soil: an acidic soil (pH below 7), will supply aluminum ions and produce flowers that are blue to purple typically, whereas an alkaline soil (pH above 7) will tie up aluminum ions and lead to pink or red flowers.
This is the effect of a color change of the rose pigments in the presence of aluminium ions which can be taken up into hyperaccumulating plant life.[6] Reducing the pH of potting soils or mixes usually does not change the rose color to blue, because these soils have no aluminum ions. The ability to blue or pink a hydrangea is also inspired by the cultivar. Some plants are selected because of 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 influenced by aluminum and cannot be changed or shifted. Hydrangeas likewise have a nickname called 'Change Rose'.
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