Hydrangea (/ha?'dre?nd?i?/;common names hydrangea or hortensia) is a genus of 70-75 species of flowering plants indigenous to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. Definitely the greatest varieties diversity is at eastern Asia, china notably, Japan, and Korea. The majority are shrubs 1 to 3 meters high, but some are small trees and shrubs, yet others lianas getting up to 30 m (98 foot) by climbing up trees. They can be either evergreen or deciduous, though the extensively cultivated temperate kinds are deciduous.Having been introduced to the Azores, H. macrophylla is currently very common, particularly on Faial, which is recognized as the "blue island" due to the multitude of hydrangeas present on the island.Life cycleHydrangea plants are produced from early spring to late autumn; they develop in flowerheads (corymbs or panicles) frequently at the ends of the stems.
Usually the flowerheads contain two types of blooms: small non-showy blossoms in the guts or interior of the flowerhead, and large, showy flowers with large bright colored sepals (tepals). These showy plants are expanded in a band often, or to the surface of the small flowers. Plant life in outrageous populations routinely have few to none of them of the showy blooms, while cultivated hydrangeas have been selected and bred to have significantly more of the larger type blooms.There are two flower arrangements in hydrangeas with Corymb style inflorescens, which include the commonly grown "bigleaf hydrangea"--Hydrangea macrophylla. Mophead plants are large rounded flowerheads resembling pom-poms or, as the name indicates, the mind of a mop. On the other hand, lacecap flowers bear round, flat flowerheads with a center core of subdued, small flowers encircled by outer wedding rings of much larger blooms having showy tepals or sepals.
The blooms of some rhododendrons and viburnums can seem, initially, very much like those of some hydrangeas.Colors and dirt acidityIn most varieties the blooms are white, but in some varieties (notably H. macrophylla), can be blue, red, green, light purple, or dark purple. In these types the color is afflicted by the existence of metal ions which are available or tangled up depending after the garden soil 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 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 the effect of a color change of the rose pigments in the presence of aluminium ions which may be taken up into hyperaccumulating crops.[6] Decreasing the pH of potting soils or mixes usually will not change the flower color to blue, because these soils haven't any aluminum ions. The ability to blue or pink a hydrangea is affected by the cultivar also. Some plants are selected for his or her ability to be blued, while others 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'.
Hydrangea serrata 27/07/2013, Kew Gardens, London
Bigleaf Hydrangeas :: Beautiful Flower Pictures Blog
Hydrangea, Hortensja: czerwca 2013
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