Hydrangea (/ha?'dre?nd?i?/;common names hydrangea or hortensia) is a genus of 70-75 kinds of flowering plants local to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. Probably the greatest species diversity is at eastern Asia, china notably, Japan, and Korea. Most are shrubs 1 to 3 meters extra tall, however, many are small trees and shrubs, yet others lianas reaching up to 30 m (98 foot) by climbing up trees and shrubs. They can be either evergreen or deciduous, though the cultivated temperate kinds are all deciduous greatly.Having been introduced to the Azores, H. macrophylla is very common now, particularly on Faial, which is known as the "blue island" because of the multitude of hydrangeas present on the island.Life cycleHydrangea blooms are created from early spring to late fall months; they increase in flowerheads (corymbs or panicles) frequently at the ends of the stems.
Typically the flowerheads contain two types of blossoms: small non-showy flowers in the guts or interior of the flowerhead, and large, showy bouquets with large brilliant sepals (tepals). These showy blossoms are expanded in a ring often, or to the surface of the small flowers. Crops in untamed populations have few to nothing of the showy bouquets typically, 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 include the commonly grown "bigleaf hydrangea"--Hydrangea macrophylla. Mophead plants are large circular flowerheads resembling pom-poms or, as the name indicates, the comparative head of the mop. On the other hand, lacecap flowers bear round, flat flowerheads with a center core of subdued, small plants ornamented by outer jewelry of much larger blossoms having showy tepals or sepals.
The plants of some rhododendrons and viburnums can look, initially, very much like those of some hydrangeas.Dirt and colors acidityIn most types the blooms are white, but in some varieties (notably H. macrophylla), can be blue, red, pink, light purple, or dark crimson. In these types the color is afflicted by the presence of aluminium ions which can be found or tied up depending after the ground 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 bloom pigments in the presence of aluminium ions which may be taken up into hyperaccumulating plant life.[6] Lowering the pH of potting soils or mixes usually will not change the flower color to blue, because these soils haven't any aluminum ions. The ability to blue or green a hydrangea is affected by the cultivar also. Some plants are selected because of their ability to be blued, while others are bred and selected to be red, pink or white. 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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