Hydrangea (/ha?'dre?nd?i?/;common labels hydrangea or hortensia) is a genus of 70-75 kinds of flowering crops native to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. Certainly the greatest types diversity is eastern Asia, china notably, Japan, and Korea. Most are shrubs 1 to 3 meters extra tall, but some are small trees and shrubs, and others lianas achieving up to 30 m (98 feet) by climbing up trees and shrubs. They can be either evergreen or deciduous, though the broadly cultivated temperate types are all deciduous.Having been introduced to the Azores, H. macrophylla is very common 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 created from planting season to late fall; they grow in flowerheads (corymbs or panicles) frequently at the ends of the stems.
Usually the flowerheads contain two types of blossoms: small non-showy bouquets in the guts or interior of the flowerhead, and large, showy blossoms with large bright colored sepals (tepals). These showy blooms are often long in a band, or to the surface of the small flowers. Vegetation in outdoors populations have few to none of the showy bouquets typically, while cultivated hydrangeas have been bred and decided on to have significantly more of the bigger type blossoms.There are two flower arrangements in hydrangeas with Corymb style inflorescens, which include the commonly grown "bigleaf hydrangea"--Hydrangea macrophylla. Mophead blooms are large spherical flowerheads resembling pom-poms or, as the name suggests, the head of any mop. On the other hand, lacecap flowers bear round, flat flowerheads with a center core of subdued, small plants ornamented by outer bands of larger flowers having showy tepals or sepals.
The bouquets of some rhododendrons and viburnums can appear, at first glance, a lot like those of some hydrangeas.Soil and colors acidityIn most types the plants are white, but in some varieties (notably H. macrophylla), can be blue, red, pink, light purple, or dark crimson. In these varieties the color is influenced by the presence of aluminum ions which are available or tangled up depending upon the garden 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 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 blossom pigments in the occurrence of aluminium ions which may be adopted into hyperaccumulating plant life.[6] Cutting down 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 influenced by the cultivar. Some plants are selected for his or her ability to be blued, while others are bred and selected to be red, white or pink. The flower color of all other Hydrangea species is not affected by aluminum and cannot be changed or shifted. Hydrangeas likewise have a nickname called 'Change Rose'.
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