Hydrangea (/ha?'dre?nd?i?/;common titles hydrangea or hortensia) is a genus of 70-75 kinds of flowering crops local to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. Undoubtedly the greatest kinds diversity is within eastern Asia, china notably, Japan, and Korea. Most are shrubs 1 to 3 meters tall, however, many are small trees, as well as others lianas attaining up to 30 m (98 feet) by climbing up trees and shrubs. They could be either deciduous or evergreen, although cultivated temperate species are deciduous broadly.Having been introduced to the Azores, H. macrophylla is now very common, particularly on Faial, which is recognized as the "blue island" due to the vast number of hydrangeas present on the island.Life cycleHydrangea flowers are produced from early spring to late fall months; they develop in flowerheads (corymbs or panicles) most often at the ends of the stems.
Typically the flowerheads contain two types of flowers: small non-showy plants in the guts or interior of the flowerhead, and large, showy flowers with large colourful sepals (tepals). These showy blossoms tend to be prolonged in a diamond ring, or to the surface of the small flowers. Plants in wild populations have few to none of the showy plants typically, while cultivated hydrangeas have been bred and decided on to have significantly 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 blossoms are large circular flowerheads resembling pom-poms or, as the name means, the relative mind of an mop. On the other hand, lacecap flowers bear round, flat flowerheads with a center core of subdued, small blossoms encircled by outer jewelry of greater plants having showy tepals or sepals.
The blooms of some rhododendrons and viburnums can seem, at first glance, just like those of some hydrangeas.Colors and land acidityIn most varieties the flowers are white, however in some varieties (notably H. macrophylla), can be blue, red, red, light purple, or dark crimson. In these types the colour is afflicted by the occurrence of light weight aluminum ions which can be found or tangled up depending after the dirt 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 caused by a color change of the rose pigments in the existence of aluminium ions that can be adopted into hyperaccumulating crops.[6] Cutting down the pH of potting soils or mixes usually will not change the bloom color to blue, because these soils have no aluminum ions. The ability to blue or green a hydrangea is also influenced by the cultivar. 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 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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