Hydrangea (/ha?'dre?nd?i?/;common names hydrangea or hortensia) is a genus of 70-75 types of flowering crops native to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. Undoubtedly the greatest varieties diversity is eastern Asia, china notably, Japan, and Korea. The majority are shrubs 1 to 3 meters high, but some are small trees, and others lianas getting up to 30 m (98 foot) by climbing up trees. They can be either deciduous or evergreen, although greatly cultivated temperate types are all deciduous.Having been introduced to the Azores, H. macrophylla is quite typical now, particularly on Faial, which is known as the "blue island" due to the vast number of hydrangeas present on the island.Life cycleHydrangea plants are created from planting season to late fall; they develop in flowerheads (corymbs or panicles) most often at the ends of the stems.
Usually the flowerheads contain two types of bouquets: small non-showy bouquets in the guts or interior of the flowerhead, and large, showy bouquets with large colourful sepals (tepals). These showy bouquets are long in a diamond ring often, or to the exterior of the small flowers. Plants in crazy populations have few to none of the showy plants typically, while cultivated hydrangeas have been bred and preferred to have significantly more of the larger type plants.There are two flower arrangements in hydrangeas with Corymb style inflorescens, which includes the commonly grown "bigleaf hydrangea"--Hydrangea macrophylla. Mophead blooms are large circular flowerheads resembling pom-poms or, as the name signifies, the comparative head of a mop. On the other hand, lacecap flowers bear round, flat flowerheads with a center core of subdued, small blossoms surrounded by outer rings of bigger plants having showy tepals or sepals.
The bouquets of some rhododendrons and viburnums can appear, initially, just like those of some hydrangeas.Ground and colors acidityIn most species the plants are white, however in some types (notably H. macrophylla), can be blue, red, green, light purple, or dark purple. In these species the colour is influenced by the presence of metal ions which are available or tied up depending after the land 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 result in pink or red flowers.
This is caused by a color change of the flower pigments in the occurrence of aluminium ions which may be adopted into hyperaccumulating crops.[6] Minimizing the pH of potting soils or mixes usually does not change the rose color to blue, because these soils have no aluminum ions. The capability to blue or green a hydrangea is also inspired by the cultivar. Some plants are selected for their ability to be blued, while some are bred and selected to be red, white or pink. The flower color of most other Hydrangea species is not damaged by aluminum and cannot be changed or shifted. Hydrangeas likewise have a nickname called 'Change Rose'.
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