Hydrangea (/ha?'dre?nd?i?/;common brands hydrangea or hortensia) is a genus of 70-75 varieties of flowering crops indigenous to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. Undoubtedly the greatest kinds diversity is in eastern Asia, china notably, Japan, and Korea. The majority are shrubs 1 to 3 meters large, but some are small trees and shrubs, and more lianas achieving up to 30 m (98 ft) by climbing up trees. They could be either evergreen or deciduous, although greatly cultivated temperate varieties are deciduous.Having been introduced to the Azores, H. macrophylla is quite typical now, on Faial particularly, which is known as the "blue island" because of the vast number of hydrangeas present on the island.Life cycleHydrangea blooms are created from planting season to late fall months; they increase in flowerheads (corymbs or panicles) frequently at the ends of the stems.
Usually the flowerheads contain two types of bouquets: small non-showy flowers in the guts or interior of the flowerhead, and large, showy blossoms with large multi-colored sepals (tepals). These showy blossoms are prolonged in a band often, or to the surface of the small flowers. Plant life in crazy populations have few to nothing of the showy bouquets typically, while cultivated hydrangeas have been bred and decided on to have more of the larger type plants.There are two flower arrangements in hydrangeas with Corymb style inflorescens, which include the commonly grown "bigleaf hydrangea"--Hydrangea macrophylla. Mophead plants are large round flowerheads resembling pom-poms or, as the name signifies, the relative head of an mop. In contrast, lacecap flowers bear round, flat flowerheads with a center core of subdued, small flowers encircled by outer rings of larger flowers having showy tepals or sepals.
The bouquets of some viburnums and rhododendrons can seem, at first glance, very much like those of some hydrangeas.Colors and land acidityIn most types the plants are white, however in some varieties (notably H. macrophylla), can be blue, red, red, light purple, or dark crimson. In these species the color is influenced by the occurrence of aluminum ions which are available or tied up depending upon the ground pH. For H. macrophylla and H. serrata cultivars, the flower color can be determined by the relative acidity of the soil: an acidic soil (pH below 7), will supply 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 the effect of a color change of the rose pigments in the existence of aluminium ions which may be adopted into hyperaccumulating plants.[6] Minimizing the pH of potting soils or mixes usually does not change the blossom color to blue, because these soils have no aluminum ions. The capability to blue or pink a hydrangea is also influenced by the cultivar. Some plants are selected for his or her 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 afflicted by aluminum and cannot be changed or shifted. Hydrangeas likewise have a nickname called 'Change Rose'.
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