Hydrangea (/ha?'dre?nd?i?/;common names hydrangea or hortensia) is a genus of 70-75 varieties of flowering vegetation local to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. By far the greatest species diversity is in eastern Asia, notably China, Japan, and Korea. The majority are shrubs 1 to 3 meters tall, however, many are small trees and shrubs, yet others lianas getting up to 30 m (98 foot) by climbing up trees and shrubs. They can be either deciduous or evergreen, although cultivated temperate types are deciduous extensively.Having been introduced to the Azores, H. macrophylla is currently very common, on Faial particularly, which is known as the "blue island" because of the vast number of hydrangeas present on the island.Life cycleHydrangea flowers are produced from planting season to late fall; 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 blooms in the guts or interior of the flowerhead, and large, showy bouquets with large bright colored sepals (tepals). These showy flowers are often extended in a ring, or to the exterior of the small flowers. Plants in outrageous populations routinely have few to none of them of the showy plants, while cultivated hydrangeas have been chosen and bred to have significantly more of the bigger type flowers.There are two flower arrangements in hydrangeas with Corymb style inflorescens, which include the commonly grown "bigleaf hydrangea"--Hydrangea macrophylla. Mophead bouquets are large rounded flowerheads resembling pom-poms or, as the name implies, the brain 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 flowers of some rhododendrons and viburnums can seem, at first glance, similar to those of some hydrangeas.Land and colors acidityIn most types the flowers are white, but in some species (notably H. macrophylla), can be blue, red, pink, light crimson, or dark purple. In these types the color is damaged by the occurrence of aluminium ions which are available or tied up depending upon the ground 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 supply aluminum ions and typically produce flowers that are blue to purple, 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 presence of aluminium ions which may be taken up into hyperaccumulating plants.[6] Decreasing 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 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 all other Hydrangea species is not affected by aluminum and cannot be changed or shifted. Hydrangeas likewise have a nickname called 'Change Rose'.
Hydrangea macrophylla ‘Jomari’
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