Hydrangea (/ha?'dre?nd?i?/;common labels hydrangea or hortensia) is a genus of 70-75 varieties of flowering plant life native to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. By far the greatest kinds diversity is in eastern Asia, china notably, Japan, and Korea. Most are shrubs 1 to 3 meters extra tall, but some are small trees, among others lianas achieving up to 30 m (98 feet) by climbing up trees. They could be either deciduous or evergreen, although cultivated temperate varieties are deciduous extensively.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 multitude of hydrangeas present on the island.Life cycleHydrangea plants are produced from early spring to late fall; they increase in flowerheads (corymbs or panicles) frequently at the ends of the stems.
Usually the flowerheads contain two types of blooms: small non-showy bouquets in the center or interior of the flowerhead, and large, showy bouquets with large brilliant sepals (tepals). These showy flowers are lengthened in a wedding ring often, or to the exterior of the small flowers. Plant life in untamed populations have few to none of them of the showy blossoms 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 includes the commonly grown "bigleaf hydrangea"--Hydrangea macrophylla. Mophead blooms are large spherical flowerheads resembling pom-poms or, as the name means, the comparative head of any 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 plants of some viburnums and rhododendrons can look, at first glance, just like those of some hydrangeas.Colors and garden soil acidityIn most types the blossoms are white, however in some types (notably H. macrophylla), can be blue, red, red, light purple, or dark crimson. In these varieties the colour is damaged by the presence of lightweight aluminum ions which can be found or tangled up depending upon 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 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 caused by a color change of the flower pigments in the existence of aluminium ions that can be adopted into hyperaccumulating plant life.[6] Decreasing the pH of potting soils or mixes usually will not change the blossom color to blue, because these soils have no aluminum ions. The capability to blue or pink a hydrangea is also affected by the cultivar. Some plants are selected because of their ability to be blued, while others are bred and selected to be red, pink or white. The flower color of most other Hydrangea species is not influenced by aluminum and can't be changed or shifted. Hydrangeas likewise have a nickname called 'Change Rose'.
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