Hydrangea (/ha?'dre?nd?i?/;common brands hydrangea or hortensia) is a genus of 70-75 types of flowering vegetation indigenous to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. Probably the greatest species diversity is within eastern Asia, notably China, Japan, and Korea. Most are shrubs 1 to 3 meters high, but some are small trees, among others lianas getting up to 30 m (98 feet) by climbing up trees and shrubs. They could be either deciduous or evergreen, although cultivated temperate types are all deciduous generally.Having been introduced to the Azores, H. macrophylla is now very common, on Faial particularly, which is recognized as the "blue island" due to the vast number of hydrangeas present on the island.Life cycleHydrangea blossoms are produced from early spring to late autumn; they expand in flowerheads (corymbs or panicles) frequently at the ends of the stems.
Typically the flowerheads contain two types of flowers: small non-showy bouquets in the guts or interior of the flowerhead, and large, showy blooms with large bright colored sepals (tepals). These showy blooms are extended in a diamond ring often, or to the exterior of the tiny flowers. Plants in outrageous populations typically have few to nothing of the showy blooms, while cultivated hydrangeas have been bred and picked to have more of the bigger type plants.There are two flower arrangements in hydrangeas with Corymb style inflorescens, which includes the commonly grown "bigleaf hydrangea"--Hydrangea macrophylla. Mophead bouquets are large circular flowerheads resembling pom-poms or, as the name implies, the relative head of your mop. In contrast, lacecap flowers bear round, flat flowerheads with a center core of subdued, small blossoms surrounded by outer wedding rings of much larger blossoms having showy tepals or sepals.
The blooms of some viburnums and rhododendrons can appear, at first glance, much like those of some hydrangeas.Soil and colors acidityIn most kinds the plants are white, however in some species (notably H. macrophylla), can be blue, red, red, light crimson, or dark purple. In these varieties the color is afflicted by the presence of aluminium ions which can be found or tangled up depending upon the garden soil pH. For H. macrophylla and H. serrata cultivars, the flower color can be dependant on the relative acidity of the soil: an acidic soil (pH below 7), will supply aluminum ions and typically produce flowers that are blue to purple, 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 bloom pigments in the presence of aluminium ions which is often adopted into hyperaccumulating plant life.[6] Bringing down the pH of potting soils or mixes usually will not change the blossom color to blue, because these soils have no aluminum ions. The capability to blue or green a hydrangea is also influenced by the cultivar. 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 damaged by aluminum and can't be changed or shifted. Hydrangeas also have a nickname called 'Change Rose'.
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