Hydrangea (/ha?'dre?nd?i?/;common labels hydrangea or hortensia) is a genus of 70-75 species of flowering plants native to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. Certainly the greatest varieties diversity is in eastern Asia, china notably, Japan, and Korea. The majority are shrubs 1 to 3 meters tall, but some are small trees, yet others lianas achieving up to 30 m (98 feet) by climbing up trees and shrubs. They could be either deciduous or evergreen, although generally cultivated temperate varieties are deciduous.Having been introduced to the Azores, H. macrophylla is very common now, on Faial particularly, which is recognized as the "blue island" because of the vast number of hydrangeas present on the island.Life cycleHydrangea plants are created from early spring to late autumn; they expand in flowerheads (corymbs or panicles) most often at the ends of the stems.
Usually the flowerheads contain two types of plants: small non-showy flowers in the center or interior of the flowerhead, and large, showy plants with large bright colored sepals (tepals). These showy blossoms are often expanded in a ring, or to the surface of the tiny flowers. Plants in outdoors populations typically have few to none of the showy plants, while cultivated hydrangeas have been bred and determined to have more of the bigger type flowers.There are two flower arrangements in hydrangeas with Corymb style inflorescens, which includes the commonly grown "bigleaf hydrangea"--Hydrangea macrophylla. Mophead plants are large round flowerheads resembling pom-poms or, as the name implies, the head of a mop. In contrast, lacecap flowers bear round, flat flowerheads with a center core of subdued, small blossoms bounded by outer bands of much larger blooms having showy tepals or sepals.
The plants of some viburnums and rhododendrons can seem, initially, much like those of some hydrangeas.Dirt and colors acidityIn most varieties the bouquets are white, however in some species (notably H. macrophylla), can be blue, red, green, light crimson, or dark purple. In these types the colour is afflicted by the presence of metal ions which can be found or tangled up depending upon the soil pH. For H. h and macrophylla. 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 bring about pink or red flowers.
This is caused by a color change of the flower pigments in the presence of aluminium ions which is often adopted into hyperaccumulating vegetation.[6] Cutting down the pH of potting soils or mixes usually does not change the blossom color to blue, because these soils haven't any aluminum ions. The ability to blue or green a hydrangea is inspired by the cultivar also. Some plants are selected for his or her 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 also have a nickname called 'Change Rose'.
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