Hydrangea (/ha?'dre?nd?i?/;common brands hydrangea or hortensia) is a genus of 70-75 types of flowering plant life indigenous to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. By far the greatest kinds diversity is eastern Asia, notably China, Japan, and Korea. The majority are shrubs 1 to 3 meters large, however, many are small trees, among others lianas achieving up to 30 m (98 feet) by climbing up trees and shrubs. They can be either deciduous or evergreen, though the greatly cultivated temperate types are all deciduous.Having been introduced to the Azores, H. macrophylla is quite typical now, on Faial particularly, which is known as the "blue island" due to the vast number of hydrangeas present on the island.Life cycleHydrangea blooms are produced from early spring to late fall; they develop in flowerheads (corymbs or panicles) most often at the ends of the stems.
Typically the flowerheads contain two types of blossoms: small non-showy plants in the guts or interior of the flowerhead, and large, showy blossoms with large bright colored sepals (tepals). These showy bouquets are prolonged in a band often, or to the exterior of the small flowers. Crops in wild populations have few to none of them of the showy flowers typically, while cultivated hydrangeas have been preferred and bred to have more of the bigger type bouquets.There are two flower arrangements in hydrangeas with Corymb style inflorescens, which includes the commonly grown "bigleaf hydrangea"--Hydrangea macrophylla. Mophead blossoms are large rounded flowerheads resembling pom-poms or, as the name implies, the brain of a 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 seem, initially, much like those of some hydrangeas.Colors and dirt acidityIn most kinds the plants are white, however in some kinds (notably H. macrophylla), can be blue, red, green, light crimson, or dark crimson. In these varieties the colour is afflicted by the occurrence of metal ions which are available or tangled up depending after the land 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 produce flowers that are blue to purple typically, 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 presence of aluminium ions which is often taken up into hyperaccumulating vegetation.[6] Decreasing the pH of potting soils or mixes usually does not change the flower color to blue, because these soils haven't any aluminum ions. The ability to blue or green a hydrangea is also influenced by the cultivar. Some plants are selected for his or her 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 cannot be changed or shifted. Hydrangeas likewise have a nickname called 'Change Rose'.
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