Hydrangea (/ha?'dre?nd?i?/;common brands hydrangea or hortensia) is a genus of 70-75 types of flowering crops native to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. Probably the greatest types diversity is within eastern Asia, notably China, Japan, and Korea. The majority are shrubs 1 to 3 meters large, however, many are small trees, as well as others lianas getting up to 30 m (98 ft) by climbing up trees and shrubs. They can be either deciduous or evergreen, though the cultivated temperate species are deciduous widely.Having been introduced to the Azores, H. macrophylla is quite typical now, particularly on Faial, which is known as the "blue island" because of the multitude of hydrangeas present on the island.Life cycleHydrangea blossoms are created from early spring to late fall; they grow in flowerheads (corymbs or panicles) frequently at the ends of the stems.
Typically the flowerheads contain two types of plants: small non-showy plants in the center or interior of the flowerhead, and large, showy blossoms with large brilliant sepals (tepals). These showy bouquets tend to be prolonged in a diamond ring, or to the exterior of the small flowers. Plants in outdoors populations have few to none of them of the showy blossoms typically, while cultivated hydrangeas have been decided on and bred to have more of the bigger type blooms.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 means, the 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 blossoms of some viburnums and rhododendrons can seem, initially, a lot like those of some hydrangeas.Ground and colors acidityIn most types the flowers are white, however in some types (notably H. macrophylla), can be blue, red, green, light crimson, or dark purple. In these types the color is afflicted by the presence of lightweight aluminum ions which are available or tangled up depending upon the land pH. For H. h and macrophylla. serrata cultivars, the flower color can be determined by 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 lead to pink or red flowers.
This is caused by a color change of the blossom pigments in the occurrence of aluminium ions which is often taken up into hyperaccumulating plant life.[6] Minimizing the pH of potting soils or mixes usually does not change the bloom color to blue, because these soils have no aluminum ions. The ability to blue or pink a hydrangea is also influenced by the cultivar. Some plants are selected because of their ability to be blued, while some are bred and selected to be red, pink or white. 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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