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 tall, however, many are small trees, among others lianas achieving up to 30 m (98 foot) by climbing up trees. They could be either evergreen or deciduous, although cultivated temperate types are all deciduous widely.Having been introduced to the Azores, H. macrophylla is quite typical now, on Faial particularly, which is recognized as the "blue island" due to the vast number of hydrangeas present on the island.Life cycleHydrangea plants are produced 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 blossoms: small non-showy plants in the center or interior of the flowerhead, and large, showy flowers with large vibrant sepals (tepals). These showy blooms tend to be expanded in a engagement ring, or to the surface of the tiny flowers. Vegetation in outrageous populations have few to none of the showy blossoms typically, while cultivated hydrangeas have been determined and bred to have significantly more of the bigger type plants.There are two flower arrangements in hydrangeas with Corymb style inflorescens, which includes the commonly grown "bigleaf hydrangea"--Hydrangea macrophylla. Mophead flowers are large spherical flowerheads resembling pom-poms or, as the name signifies, the comparative head 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 flowers of some viburnums and rhododendrons can show up, at first glance, much like those of some hydrangeas.Colors and earth acidityIn most varieties the plants are white, but in some types (notably H. macrophylla), can be blue, red, pink, light crimson, or dark purple. In these varieties the color is influenced by the occurrence of aluminum ions which can be found or tied 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 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 result in pink or red flowers.
This is caused by a color change of the bloom pigments in the occurrence of aluminium ions that can be adopted into hyperaccumulating crops.[6] Decreasing the pH of potting soils or mixes usually does not change the bloom color to blue, because these soils have no aluminum ions. The ability to blue or green a hydrangea is affected by the cultivar also. Some plants are selected because of their 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 affected by aluminum and can't be changed or shifted. Hydrangeas likewise have a nickname called 'Change Rose'.
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