Hydrangea (/ha?'dre?nd?i?/;common labels hydrangea or hortensia) is a genus of 70-75 species of flowering crops local to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. Certainly the greatest species diversity is in eastern Asia, notably China, Japan, and Korea. The majority are shrubs 1 to 3 meters high, but some are small trees, and more lianas achieving up to 30 m (98 feet) by climbing up trees. They could be either deciduous or evergreen, though the cultivated temperate species are all deciduous broadly.Having been introduced to the Azores, H. macrophylla is now very common, on Faial particularly, which is known as the "blue island" because of the vast number of hydrangeas present on the island.Life cycleHydrangea flowers are created from planting season to late fall; they develop in flowerheads (corymbs or panicles) most often at the ends of the stems.
Typically 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 colourful sepals (tepals). These showy bouquets are lengthened in a engagement ring often, or to the exterior of the tiny flowers. Crops in wild populations typically have few to nothing of the showy flowers, while cultivated hydrangeas have been selected and bred to have 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 plants are large spherical flowerheads resembling pom-poms or, as the name implies, the relative brain of the mop. In contrast, 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 blooms of some rhododendrons and viburnums can seem, initially, just like those of some hydrangeas.Land and colors acidityIn most varieties the bouquets are white, however in some species (notably H. macrophylla), can be blue, red, green, light purple, or dark purple. In these kinds the color is afflicted by the existence of aluminium ions which can be found or tied up depending after the ground 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 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 the effect of a color change of the bloom pigments in the existence of aluminium ions which is often adopted into hyperaccumulating plant life.[6] Bringing down the pH of potting soils or mixes usually will not change the flower color to blue, because these soils have no aluminum ions. The ability 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, pink or white. The flower color of most other Hydrangea species is not afflicted by aluminum and cannot be changed or shifted. Hydrangeas also have a nickname called 'Change Rose'.
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