Hydrangea (/ha?'dre?nd?i?/;common names hydrangea or hortensia) is a genus of 70-75 types of flowering plant life indigenous to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. Undoubtedly the greatest kinds diversity is in eastern Asia, notably China, Japan, and Korea. Most are shrubs 1 to 3 meters large, however, many are small trees, and more lianas achieving up to 30 m (98 feet) by climbing up trees. They can be either deciduous or evergreen, though the greatly cultivated temperate types are deciduous.Having been introduced to the Azores, H. macrophylla is currently very common, on Faial particularly, which is known as the "blue island" due to the multitude of hydrangeas present on the island.Life cycleHydrangea flowers are created from early spring to late fall; they grow in flowerheads (corymbs or panicles) frequently at the ends of the stems.
Usually the flowerheads contain two types of bouquets: small non-showy blooms in the center or interior of the flowerhead, and large, showy plants with large brilliant sepals (tepals). These showy blossoms tend to be long in a engagement ring, or to the surface of the small flowers. Crops in outdoors populations have few to none of the showy plants typically, while cultivated hydrangeas have been bred and preferred to have more of the bigger type bouquets.There are two flower arrangements in hydrangeas with Corymb style inflorescens, which includes the commonly grown "bigleaf hydrangea"--Hydrangea macrophylla. Mophead plants are large rounded flowerheads resembling pom-poms or, as the name means, the head of any 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 blooms of some rhododendrons and viburnums can appear, at first glance, similar to those of some hydrangeas.Earth and colors acidityIn most types the flowers are white, however in some kinds (notably H. macrophylla), can be blue, red, pink, light crimson, or dark purple. In these kinds the colour is affected by the occurrence of lightweight aluminum ions which are available or tangled up depending after the land 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 result in pink or red flowers.
This is caused by a color change of the rose pigments in the occurrence of aluminium ions which may be taken up into hyperaccumulating plant life.[6] Reducing the pH of potting soils or mixes usually does not change the rose color to blue, because these soils have no aluminum ions. The ability to blue or pink 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, white or pink. The flower color of all other Hydrangea species is not afflicted by aluminum and can't be changed or shifted. Hydrangeas likewise have a nickname called 'Change Rose'.
JULIAN ARTHUR ALTOBELLIS 19191988
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