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. Certainly the greatest types diversity is in eastern Asia, china notably, Japan, and Korea. The majority are shrubs 1 to 3 meters high, but some are small trees, yet others lianas attaining up to 30 m (98 foot) by climbing up trees and shrubs. They could be either evergreen or deciduous, though the broadly cultivated temperate varieties are all deciduous.Having been introduced to the Azores, H. macrophylla is currently very common, on Faial particularly, which is recognized as the "blue island" due to the multitude of hydrangeas present on the island.Life cycleHydrangea flowers are produced from early spring to late fall months; they expand in flowerheads (corymbs or panicles) most often at the ends of the stems.
Usually the flowerheads contain two types of plants: small non-showy blossoms in the center or interior of the flowerhead, and large, showy blooms with large bright colored sepals (tepals). These showy flowers tend to be long in a band, or to the surface of the small flowers. Crops in outrageous populations have few to none of them of the showy bouquets typically, while cultivated hydrangeas have been decided on and bred to have more of the larger type blossoms.There are two flower arrangements in hydrangeas with Corymb style inflorescens, which include the commonly grown "bigleaf hydrangea"--Hydrangea macrophylla. Mophead bouquets are large circular flowerheads resembling pom-poms or, as the name suggests, 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 flowers of some rhododendrons and viburnums can appear, initially, just like those of some hydrangeas.Dirt and colors acidityIn most types the plants are white, however in some varieties (notably H. macrophylla), can be blue, red, red, light purple, or dark crimson. In these types the color is afflicted by the occurrence of aluminum ions which can be found or tangled up depending after the ground 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 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 flower pigments in the presence of aluminium ions which may be adopted into hyperaccumulating plant life.[6] Reducing the pH of potting soils or mixes usually will not change the rose color to blue, because these soils have no aluminum ions. The ability to blue or green a hydrangea is influenced by the cultivar also. Some plants are selected for their 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 cannot be changed or shifted. Hydrangeas likewise have a nickname called 'Change Rose'.
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