Hydrangea (/ha?'dre?nd?i?/;common brands 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 species diversity is at eastern Asia, china notably, Japan, and Korea. Most are shrubs 1 to 3 meters tall, however, many are small trees and shrubs, while others lianas getting up to 30 m (98 ft) by climbing up trees. They can be either deciduous or evergreen, though the widely cultivated temperate varieties are all deciduous.Having been introduced to the Azores, H. macrophylla is very common now, particularly on Faial, which is known as the "blue island" because of the vast number of hydrangeas present on the island.Life cycleHydrangea plants are produced from early spring to late autumn; they grow in flowerheads (corymbs or panicles) frequently at the ends of the stems.
Usually the flowerheads contain two types of blossoms: small non-showy blooms in the center or interior of the flowerhead, and large, showy flowers with large bright colored sepals (tepals). These showy bouquets are extended in a wedding ring often, or to the exterior of the tiny flowers. Plants in wild populations routinely have few to none of the showy flowers, while cultivated hydrangeas have been bred and chosen to have more of the bigger type blooms.There are two flower arrangements in hydrangeas with Corymb style inflorescens, which include the commonly grown "bigleaf hydrangea"--Hydrangea macrophylla. Mophead flowers are large spherical flowerheads resembling pom-poms or, as the name means, the comparative brain of your mop. On the other hand, lacecap flowers bear round, flat flowerheads with a center core of subdued, small bouquets ornamented by outer jewelry of much larger flowers having showy tepals or sepals.
The flowers of some rhododendrons and viburnums can seem, at first glance, much like those of some hydrangeas.Earth and colors acidityIn most species the blossoms are white, however in some varieties (notably H. macrophylla), can be blue, red, red, light purple, or dark crimson. In these varieties the color is damaged by the existence of metal ions which are available or tangled up depending after the garden soil 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 lead to pink or red flowers.
This is the effect of a color change of the bloom pigments in the occurrence of aluminium ions which can be taken up into hyperaccumulating plant life.[6] Cutting down the pH of potting soils or mixes usually will not change the flower color to blue, because these soils have no aluminum ions. The ability to blue or green a hydrangea is inspired by the cultivar also. Some plants are selected for his or her ability to be blued, while some are bred and selected to be red, white or pink. The flower color of all other Hydrangea species is not influenced by aluminum and cannot be changed or shifted. Hydrangeas also have a nickname called 'Change Rose'.
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