Hydrangea (/ha?'dre?nd?i?/;common brands hydrangea or hortensia) is a genus of 70-75 species of flowering plant life native to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. By far the greatest kinds diversity is in eastern Asia, notably China, Japan, and Korea. Most are shrubs 1 to 3 meters extra tall, but some are small trees, while others lianas getting up to 30 m (98 ft) by climbing up trees. They can be either deciduous or evergreen, though the widely cultivated temperate types are deciduous.Having been introduced to the Azores, H. macrophylla is quite typical now, on Faial particularly, which is recognized as the "blue island" due to the vast number of hydrangeas present on the island.Life cycleHydrangea flowers are created from planting season to late autumn; they expand in flowerheads (corymbs or panicles) frequently at the ends of the stems.
Usually the flowerheads contain two types of blossoms: small non-showy plants in the center or interior of the flowerhead, and large, showy bouquets with large vibrant sepals (tepals). These showy blooms are prolonged in a diamond ring often, or to the exterior of the tiny flowers. Plants in outrageous populations have few to none of them of the showy plants typically, while cultivated hydrangeas have been determined and bred to have significantly 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 flowers are large round flowerheads resembling pom-poms or, as the name indicates, 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 blossoms of some rhododendrons and viburnums can seem, initially, much like those of some hydrangeas.Ground and colors acidityIn most types the blooms are white, however in some varieties (notably H. macrophylla), can be blue, red, green, light crimson, or dark purple. In these species the colour is affected by the existence of aluminum ions which can be found or tangled up depending upon the ground 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 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 cause pink or red flowers.
This is the effect of a color change of the blossom pigments in the occurrence of aluminium ions which may be adopted into hyperaccumulating plants.[6] Cutting down the pH of potting soils or mixes usually will not change the flower color to blue, because these soils have no aluminum ions. The capability to blue or green a hydrangea is also inspired by the cultivar. Some plants are selected for their ability to be blued, while some are bred and selected to be red, pink or white. The flower color of all other Hydrangea species is not influenced by aluminum and cannot be changed or shifted. Hydrangeas also have a nickname called 'Change Rose'.
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