Hydrangea (/ha?'dre?nd?i?/;common labels 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 within eastern Asia, notably China, Japan, and Korea. Most are shrubs 1 to 3 meters extra tall, but some are small trees, and others lianas achieving up to 30 m (98 foot) by climbing up trees and shrubs. They could be either deciduous or evergreen, though the generally cultivated temperate kinds are all deciduous.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 produced from planting season to late fall; they expand in flowerheads (corymbs or panicles) most often at the ends of the stems.
Typically the flowerheads contain two types of blossoms: small non-showy blossoms in the guts or interior of the flowerhead, and large, showy blossoms with large bright colored sepals (tepals). These showy blooms tend to be lengthened in a wedding ring, or to the surface of the small flowers. Plant life in outrageous populations have few to nothing of the showy plants typically, while cultivated hydrangeas have been decided on and bred to have 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 spherical flowerheads resembling pom-poms or, as the name suggests, the comparative mind of the 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 show up, at first glance, similar to those of some hydrangeas.Soil and colors acidityIn most species the plants are white, however in some types (notably H. macrophylla), can be blue, red, green, light crimson, or dark crimson. In these types the color is influenced by the existence of lightweight aluminum ions which can be found or tangled up depending after 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 produce flowers that are blue to purple typically, whereas an alkaline soil (pH above 7) will tie up aluminum ions and bring about pink or red flowers.
This is the effect of a color change of the blossom pigments in the presence of aluminium ions that can be taken up into hyperaccumulating vegetation.[6] Minimizing the pH of potting soils or mixes usually does not change the blossom color to blue, because these soils have no aluminum ions. The capability to blue or pink a hydrangea is affected by the cultivar also. Some plants are selected for their ability to be blued, while others are bred and selected to be red, white or pink. The flower color of most other Hydrangea species is not affected by aluminum and cannot be changed or shifted. Hydrangeas also have a nickname called 'Change Rose'.
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