Hydrangea (/ha?'dre?nd?i?/;common labels hydrangea or hortensia) is a genus of 70-75 species of flowering plant life native to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. Definitely the greatest species diversity is at eastern Asia, china notably, Japan, and Korea. The majority are shrubs 1 to 3 meters extra tall, however, many are small trees, and others lianas reaching up to 30 m (98 ft) by climbing up trees. They could be either evergreen or deciduous, although widely cultivated temperate species are all deciduous.Having been introduced to the Azores, H. macrophylla is now very common, on Faial particularly, which is recognized as the "blue island" because of the vast number of hydrangeas present on the island.Life cycleHydrangea blooms are produced from early spring to late autumn; they develop in flowerheads (corymbs or panicles) most often at the ends of the stems.
Typically the flowerheads contain two types of blooms: small non-showy bouquets in the center or interior of the flowerhead, and large, showy flowers with large multi-colored sepals (tepals). These showy flowers tend to be long in a diamond ring, or to the surface of the small flowers. Vegetation in outdoors populations have few to none of the showy blossoms typically, while cultivated hydrangeas have been determined and bred to have more of the bigger type blooms.There are two flower arrangements in hydrangeas with Corymb style inflorescens, which include the commonly grown "bigleaf hydrangea"--Hydrangea macrophylla. Mophead bouquets are large rounded flowerheads resembling pom-poms or, as the name indicates, the comparative head of any 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 plants of some viburnums and rhododendrons can look, at first glance, just like those of some hydrangeas.Dirt and colors acidityIn most kinds the flowers are white, but in some species (notably H. macrophylla), can be blue, red, green, light crimson, or dark crimson. In these varieties the color is affected by the occurrence of light weight aluminum ions which can be found or tangled up depending upon 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 typically produce flowers that are blue to purple, 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 blossom pigments in the presence of aluminium ions which may be adopted into hyperaccumulating plants.[6] Reducing the pH of potting soils or mixes usually will not change the flower color to blue, because these soils have no aluminum ions. The capability to blue or green a hydrangea is also inspired by the cultivar. Some plants are selected for his or her ability to be blued, while some are bred and selected to be red, white or pink. The flower color of all other Hydrangea species is not affected by aluminum and can't be changed or shifted. Hydrangeas also have a nickname called 'Change Rose'.
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