Hydrangea (/ha?'dre?nd?i?/;common names hydrangea or hortensia) is a genus of 70-75 species of flowering vegetation local to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. Undoubtedly the greatest types diversity is within eastern Asia, china notably, Japan, and Korea. Most are shrubs 1 to 3 meters high, but some are small trees, and more lianas getting up to 30 m (98 foot) by climbing up trees. They can be either evergreen or deciduous, although broadly cultivated temperate species are deciduous.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 blooms are produced from early spring 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 flowers: small non-showy blooms in the guts or interior of the flowerhead, and large, showy blossoms with large bright colored sepals (tepals). These showy blooms are often prolonged in a engagement ring, or to the exterior of the small flowers. Plant life in outrageous populations have few to nothing of the showy flowers typically, while cultivated hydrangeas have been bred and selected to have more of the larger type bouquets.There are two flower arrangements in hydrangeas with Corymb style inflorescens, which includes the commonly grown "bigleaf hydrangea"--Hydrangea macrophylla. Mophead blooms are large rounded flowerheads resembling pom-poms or, as the name signifies, the comparative brain of your mop. On the other hand, lacecap flowers bear round, flat flowerheads with a center core of subdued, small plants bounded by outer wedding rings of bigger flowers having showy tepals or sepals.
The plants of some viburnums and rhododendrons can appear, at first glance, a lot like those of some hydrangeas.Soil and colors acidityIn most types the blossoms are white, but in some types (notably H. macrophylla), can be blue, red, green, light purple, or dark crimson. In these types the color is damaged by the occurrence of lightweight aluminum ions which can be found or tied up depending upon 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 bring about pink or red flowers.
This is caused by a color change of the flower pigments in the occurrence of aluminium ions that can be adopted into hyperaccumulating plants.[6] Reducing 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 green a hydrangea is inspired by the cultivar also. 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 affected by aluminum and cannot be changed or shifted. Hydrangeas also have a nickname called 'Change Rose'.
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