Hydrangea (/ha?'dre?nd?i?/;common labels hydrangea or hortensia) is a genus of 70-75 species of flowering crops local to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. Probably the greatest varieties diversity is at eastern Asia, china notably, Japan, and Korea. The majority are shrubs 1 to 3 meters large, however, many are small trees and shrubs, and more lianas getting up to 30 m (98 ft) by climbing up trees. They could be either deciduous or evergreen, though the cultivated temperate types are deciduous broadly.Having been introduced to the Azores, H. macrophylla is quite typical now, 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 planting season to late fall months; they grow in flowerheads (corymbs or panicles) frequently at the ends of the stems.
Typically the flowerheads contain two types of bouquets: small non-showy plants in the guts or interior of the flowerhead, and large, showy flowers with large brilliant sepals (tepals). These showy plants are often long in a ring, or to the surface of the small flowers. Plants in outdoors populations have few to none of them of the showy blooms typically, while cultivated hydrangeas have been bred and chosen 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 flowers are large spherical flowerheads resembling pom-poms or, as the name signifies, the brain of an 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 rhododendrons and viburnums can appear, initially, much like those of some hydrangeas.Soil and colors acidityIn most types the blooms are white, but in some types (notably H. macrophylla), can be blue, red, pink, light purple, or dark crimson. In these species the colour is damaged by the existence of lightweight aluminum ions which can be found or tangled up depending upon the ground pH. For H. macrophylla and H. 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 rose pigments in the presence of aluminium ions which may be adopted 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 ability to blue or green a hydrangea is also affected by the cultivar. Some plants are selected for their ability to be blued, while some are bred and selected to be red, white or pink. The flower color of most other Hydrangea species is not damaged by aluminum and cannot be changed or shifted. Hydrangeas likewise have a nickname called 'Change Rose'.
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