Hydrangea (/ha?'dre?nd?i?/;common titles hydrangea or hortensia) is a genus of 70-75 varieties of flowering vegetation indigenous to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. Definitely the greatest types diversity is in eastern Asia, notably China, Japan, and Korea. The majority are shrubs 1 to 3 meters large, but some are small trees, and more lianas attaining up to 30 m (98 foot) by climbing up trees and shrubs. They could be either evergreen or deciduous, although cultivated temperate species are deciduous greatly.Having been introduced to the Azores, H. macrophylla is currently very common, particularly on Faial, which is known as the "blue island" due to 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.
Typically the flowerheads contain two types of flowers: small non-showy bouquets in the guts or interior of the flowerhead, and large, showy flowers with large bright colored sepals (tepals). These showy bouquets are often expanded in a diamond ring, or to the surface of the small flowers. Plants in outdoors populations have few to nothing of the showy plants typically, while cultivated hydrangeas have been bred and picked to have significantly more of the bigger type bouquets.There are two flower arrangements in hydrangeas with Corymb style inflorescens, which include the commonly grown "bigleaf hydrangea"--Hydrangea macrophylla. Mophead blossoms are large spherical flowerheads resembling pom-poms or, as the name means, the brain of your 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 blossoms of some viburnums and rhododendrons can appear, at first glance, very much like those of some hydrangeas.Soil and colors acidityIn most species the blooms are white, however in some species (notably H. macrophylla), can be blue, red, red, light purple, or dark purple. In these types the color is affected by the occurrence of lightweight aluminum ions which are available or tangled up depending upon the earth pH. For H. macrophylla and H. 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 result in pink or red flowers.
This is the effect of a color change of the bloom pigments in the presence of aluminium ions which may be adopted into hyperaccumulating plant life.[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 capability to blue or green a hydrangea is influenced by the cultivar also. Some plants are selected for their ability to be blued, while others are bred and selected to be red, white or pink. 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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