Hydrangea (/ha?'dre?nd?i?/;common names hydrangea or hortensia) is a genus of 70-75 varieties of flowering plants indigenous to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. Probably the greatest kinds diversity is eastern Asia, notably China, Japan, and Korea. Most are shrubs 1 to 3 meters tall, but some are small trees, among others lianas reaching up to 30 m (98 ft) by climbing up trees. They could be either deciduous or evergreen, though the cultivated temperate species are deciduous widely.Having been introduced to the Azores, H. macrophylla is now very common, particularly on Faial, which is recognized as the "blue island" because of the vast number of hydrangeas present on the island.Life cycleHydrangea flowers are created from planting season to late fall months; they expand in flowerheads (corymbs or panicles) most often at the ends of the stems.
Usually the flowerheads contain two types of bouquets: small non-showy blossoms in the center or interior of the flowerhead, and large, showy flowers with large brilliant sepals (tepals). These showy bouquets tend to be prolonged in a diamond ring, or to the exterior of the tiny flowers. Vegetation in wild populations typically have few to nothing of the showy blooms, while cultivated hydrangeas have been bred and preferred 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 flowers are large spherical flowerheads resembling pom-poms or, as the name suggests, the mind of a 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 blossoms of some viburnums and rhododendrons can seem, at first glance, similar to those of some hydrangeas.Land and colors acidityIn most types the blossoms are white, but in some kinds (notably H. macrophylla), can be blue, red, red, light crimson, or dark purple. In these types the color is affected by the presence of aluminum ions which can be found or tangled up depending upon 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 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 cause pink or red flowers.
This is the effect of a color change of the flower pigments in the occurrence of aluminium ions which can be adopted into hyperaccumulating plants.[6] Lowering 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 damaged by aluminum and cannot be changed or shifted. Hydrangeas also have a nickname called 'Change Rose'.
It’s June, and hydrangeas are busting out all over at the 7th annual
On le dit parfumé mais avec mon odorat peu affuté je n39;ai rien senti
Hydrangea paniculata ‘Kyushu’ Flower 28/08/2014, Rue de la Pointe
hydrangea by oprisco
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