Hydrangea (/ha?'dre?nd?i?/;common brands hydrangea or hortensia) is a genus of 70-75 kinds of flowering crops indigenous to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. Probably the greatest types diversity is within eastern Asia, china notably, Japan, and Korea. Most are shrubs 1 to 3 meters large, however, many are small trees, while others lianas getting up to 30 m (98 ft) by climbing up trees. They can be either deciduous or evergreen, although widely cultivated temperate kinds are all deciduous.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 multitude of hydrangeas present on the island.Life cycleHydrangea blossoms are created 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 blossoms: small non-showy bouquets in the guts or interior of the flowerhead, and large, showy bouquets with large bright colored sepals (tepals). These showy plants are expanded in a engagement ring often, or to the exterior of the small flowers. Crops in outrageous populations have few to none of the showy bouquets typically, while cultivated hydrangeas have been bred and decided on to have significantly more of the bigger type blooms.There are two flower arrangements in hydrangeas with Corymb style inflorescens, which includes the commonly grown "bigleaf hydrangea"--Hydrangea macrophylla. Mophead bouquets are large rounded flowerheads resembling pom-poms or, as the name suggests, the mind of the mop. In contrast, 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 bouquets of some rhododendrons and viburnums can seem, at first glance, just like those of some hydrangeas.Soil and colors acidityIn most varieties the flowers are white, however in some types (notably H. macrophylla), can be blue, red, green, light purple, or dark purple. In these kinds the color is damaged by the presence of light weight aluminum ions which are available or tangled up depending after the land 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 result in pink or red flowers.
This is caused by a color change of the blossom pigments in the presence of aluminium ions which is often taken up into hyperaccumulating plant life.[6] Minimizing the pH of potting soils or mixes usually will not change the rose 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 some are bred and selected to be red, pink or white. The flower color of all 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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