Hydrangea (/ha?'dre?nd?i?/;common titles 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. Probably the greatest kinds diversity is in eastern Asia, china notably, Japan, and Korea. The majority are shrubs 1 to 3 meters tall, but some are small trees, yet others lianas reaching up to 30 m (98 foot) by climbing up trees. They can be either evergreen or deciduous, although cultivated temperate species are deciduous extensively.Having been introduced to the Azores, H. macrophylla is very common now, on Faial particularly, which is known as the "blue island" due to the multitude of hydrangeas present on the island.Life cycleHydrangea flowers are created from early spring to late autumn; they increase in flowerheads (corymbs or panicles) most often at the ends of the stems.
Usually the flowerheads contain two types of flowers: small non-showy flowers in the guts or interior of the flowerhead, and large, showy bouquets with large bright colored sepals (tepals). These showy bouquets are extended in a engagement ring often, or to the surface of the small flowers. Crops in wild populations have few to none of them of the showy bouquets typically, while cultivated hydrangeas have been determined and bred to have significantly more of the bigger type flowers.There are two flower arrangements in hydrangeas with Corymb style inflorescens, which include the commonly grown "bigleaf hydrangea"--Hydrangea macrophylla. Mophead blossoms are large circular flowerheads resembling pom-poms or, as the name signifies, the head of the mop. On the other hand, lacecap flowers bear round, flat flowerheads with a center core of subdued, small bouquets surrounded by outer bands of larger flowers having showy tepals or sepals.
The bouquets of some rhododendrons and viburnums can appear, initially, much like those of some hydrangeas.Dirt and colors acidityIn most types the flowers are white, however in some species (notably H. macrophylla), can be blue, red, green, light crimson, or dark purple. In these species the colour is afflicted by the presence of light weight aluminum ions which are available or tied up depending after the soil 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 have available aluminum ions and produce flowers that are blue to purple typically, whereas an alkaline soil (pH above 7) will tie up aluminum ions and lead to pink or red flowers.
This is the effect of a color change of the flower pigments in the existence of aluminium ions which can be taken up into hyperaccumulating plants.[6] Minimizing the pH of potting soils or mixes usually does not change the rose color to blue, because these soils haven't any aluminum ions. The capability to blue or green a hydrangea is also inspired by the cultivar. 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 influenced by aluminum and can't be changed or shifted. Hydrangeas likewise have a nickname called 'Change Rose'.
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