Hydrangea (/ha?'dre?nd?i?/;common labels hydrangea or hortensia) is a genus of 70-75 types of flowering plants indigenous to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. Undoubtedly the greatest kinds diversity is at eastern Asia, china notably, Japan, and Korea. The majority are shrubs 1 to 3 meters extra tall, however, many are small trees and shrubs, yet others lianas achieving up to 30 m (98 foot) by climbing up trees. They can be either evergreen or deciduous, though the cultivated temperate varieties are all deciduous generally.Having been introduced to the Azores, H. macrophylla is currently very common, particularly on Faial, which is known as the "blue island" due to the vast number of hydrangeas present on the island.Life cycleHydrangea blossoms are produced from early spring 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 bouquets: small non-showy bouquets in the guts or interior of the flowerhead, and large, showy bouquets with large bright colored sepals (tepals). These showy plants are extended in a diamond ring often, or to the surface of the small flowers. Plant life in outrageous populations have few to none of the showy blooms typically, while cultivated hydrangeas have been determined and bred to have more of the larger type bouquets.There are two flower arrangements in hydrangeas with Corymb style inflorescens, which include the commonly grown "bigleaf hydrangea"--Hydrangea macrophylla. Mophead plants are large spherical flowerheads resembling pom-poms or, as the name suggests, the head of a 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 plants of some viburnums and rhododendrons can seem, at first glance, much like those of some hydrangeas.Colors and dirt acidityIn most kinds the plants are white, however in some species (notably H. macrophylla), can be blue, red, green, light crimson, or dark crimson. In these types the colour is afflicted by the presence of aluminium ions which can be found or tied up depending upon the ground pH. For H. h and macrophylla. 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 produce flowers that are blue to purple typically, whereas an alkaline soil (pH above 7) will tie up aluminum ions and cause pink or red flowers.
This is caused by a color change of the bloom pigments in the occurrence of aluminium ions which may be adopted into hyperaccumulating plants.[6] Bringing down the pH of potting soils or mixes usually does not change the rose color to blue, because these soils have no aluminum ions. The ability to blue or green a hydrangea is also influenced by the cultivar. Some plants are selected because of their ability to be blued, while some are bred and selected to be red, pink or white. The flower color of all other Hydrangea species is not influenced by aluminum and can't be changed or shifted. Hydrangeas likewise have a nickname called 'Change Rose'.
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