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. Definitely the greatest species diversity is within eastern Asia, notably China, Japan, and Korea. Most are shrubs 1 to 3 meters large, but some are small trees, and others lianas attaining up to 30 m (98 feet) by climbing up trees. They can be either evergreen or deciduous, although broadly cultivated temperate varieties are 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 bouquets are produced from early spring to late autumn; they grow in flowerheads (corymbs or panicles) most often at the ends of the stems.
Typically the flowerheads contain two types of flowers: small non-showy blooms in the center or interior of the flowerhead, and large, showy flowers with large multi-colored sepals (tepals). These showy flowers are long in a band often, or to the surface of the tiny flowers. Plants in untamed populations routinely have few to none of the showy plants, while cultivated hydrangeas have been determined and bred to have significantly more of the bigger type plants.There are two flower arrangements in hydrangeas with Corymb style inflorescens, which include the commonly grown "bigleaf hydrangea"--Hydrangea macrophylla. Mophead blossoms are large rounded flowerheads resembling pom-poms or, as the name suggests, the mind of a mop. In contrast, lacecap flowers bear round, flat flowerheads with a center core of subdued, small flowers surrounded by outer wedding rings of larger flowers having showy tepals or sepals.
The flowers of some rhododendrons and viburnums can seem, at first glance, just like those of some hydrangeas.Soil and colors acidityIn most kinds the bouquets are white, but in some kinds (notably H. macrophylla), can be blue, red, green, light crimson, or dark purple. In these varieties the color is influenced by the presence of aluminium ions which are available or tied up depending upon the land 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 have available aluminum ions and typically produce flowers that are blue to purple, whereas an alkaline soil (pH above 7) will tie up aluminum ions and cause pink or red flowers.
This is caused by a color change of the bloom pigments in the occurrence of aluminium ions which may be taken up into hyperaccumulating plants.[6] Reducing 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 affected by the cultivar also. Some plants are selected because of their 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 afflicted by aluminum and can't be changed or shifted. Hydrangeas also have a nickname called 'Change Rose'.
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