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. By far the greatest types diversity is at eastern Asia, notably China, Japan, and Korea. The majority are shrubs 1 to 3 meters large, however, many are small trees, while others lianas getting up to 30 m (98 foot) by climbing up trees. They can be either evergreen or deciduous, though the cultivated temperate kinds are deciduous widely.Having been introduced to the Azores, H. macrophylla is currently very common, particularly on Faial, which is known as the "blue island" because of the multitude of hydrangeas present on the island.Life cycleHydrangea bouquets are produced from planting season to late fall; they increase in flowerheads (corymbs or panicles) frequently at the ends of the stems.
Typically the flowerheads contain two types of plants: small non-showy flowers in the center or interior of the flowerhead, and large, showy blooms with large colorful sepals (tepals). These showy plants are expanded in a diamond ring often, or to the exterior of the small flowers. Plant life in outrageous populations have few to none of them of the showy blossoms typically, while cultivated hydrangeas have been bred and selected to have significantly more of the larger type flowers.There are two flower arrangements in hydrangeas with Corymb style inflorescens, which include the commonly grown "bigleaf hydrangea"--Hydrangea macrophylla. Mophead plants are large spherical flowerheads resembling pom-poms or, as the name implies, the comparative mind of an 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 plants of some rhododendrons and viburnums can seem, at first glance, much like those of some hydrangeas.Colors and ground acidityIn most kinds the blooms are white, however in some varieties (notably H. macrophylla), can be blue, red, pink, light purple, or dark purple. In these species the color is damaged by the occurrence of light weight aluminum ions which can be found or tangled up depending after the earth 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 cause pink or red flowers.
This is the effect of a color change of the rose pigments in the presence of aluminium ions which can be taken up into hyperaccumulating plants.[6] Cutting down the pH of potting soils or mixes usually does not change the bloom 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 all other Hydrangea species is not damaged by aluminum and cannot be changed or shifted. Hydrangeas also have a nickname called 'Change Rose'.
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