Hydrangea (/ha?'dre?nd?i?/;common labels hydrangea or hortensia) is a genus of 70-75 varieties of flowering plant life local to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. Definitely the greatest varieties diversity is eastern Asia, china notably, Japan, and Korea. Most are shrubs 1 to 3 meters extra tall, however, many are small trees, while others lianas achieving up to 30 m (98 foot) by climbing up trees. They could be either deciduous or evergreen, although cultivated temperate types are all deciduous generally.Having been introduced to the Azores, H. macrophylla is quite typical now, particularly on Faial, which is known as the "blue island" because of the multitude of hydrangeas present on the island.Life cycleHydrangea plants are created from early spring to late fall months; they expand in flowerheads (corymbs or panicles) frequently at the ends of the stems.
Usually the flowerheads contain two types of plants: small non-showy bouquets in the center or interior of the flowerhead, and large, showy blooms with large colorful sepals (tepals). These showy flowers are often extended in a engagement ring, or to the surface of the tiny flowers. Plants in outdoors populations typically have few to none of the showy blossoms, while cultivated hydrangeas have been preferred and bred to have more of the larger type bouquets.There are two flower arrangements in hydrangeas with Corymb style inflorescens, which includes the commonly grown "bigleaf hydrangea"--Hydrangea macrophylla. Mophead blooms are large spherical flowerheads resembling pom-poms or, as the name suggests, the comparative mind of your 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 plants of some viburnums and rhododendrons can appear, at first glance, just like those of some hydrangeas.Colors and soil acidityIn most varieties the blossoms are white, however in some types (notably H. macrophylla), can be blue, red, pink, light purple, or dark purple. In these varieties the color is afflicted by the occurrence of lightweight aluminum ions which can be found or tied up depending upon the earth pH. For H. macrophylla and H. serrata cultivars, the flower color can be determined by the relative acidity of the soil: an acidic soil (pH below 7), will supply 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 bloom pigments in the occurrence of aluminium ions which may be taken up into hyperaccumulating plant life.[6] Reducing the pH of potting soils or mixes usually does not change the blossom color to blue, because these soils have no aluminum ions. The ability to blue or green a hydrangea is also influenced by the cultivar. Some plants are selected for their ability to be blued, while others are bred and selected to be red, pink or white. The flower color of most other Hydrangea species is not damaged by aluminum and cannot be changed or shifted. Hydrangeas likewise have a nickname called 'Change Rose'.
Hydrangea quercifolia Oakleaf Hydrangea Zone 59. White flowers in
Oakleaf Hydrangea Hydrangea quercifolia Height: 4639; Spread: 68
Hydrangea quercifolia 27/07/2013, Kew Gardens, London
Hydrangea quercifolia quot;Snow Queenquot; Flickr Photo Sharing!
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