Hydrangea (/ha?'dre?nd?i?/;common titles hydrangea or hortensia) is a genus of 70-75 types of flowering crops indigenous to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. By far the greatest types diversity is at eastern Asia, china notably, Japan, and Korea. The majority are shrubs 1 to 3 meters high, however, many are small trees, among others lianas achieving up to 30 m (98 feet) by climbing up trees. They could be either deciduous or evergreen, although generally cultivated temperate species are deciduous.Having been introduced to the Azores, H. macrophylla is very common now, particularly on Faial, which is known as the "blue island" because of the vast number of hydrangeas present on the island.Life cycleHydrangea bouquets are created from planting season to late autumn; they expand in flowerheads (corymbs or panicles) most often at the ends of the stems.
Usually the flowerheads contain two types of blooms: small non-showy flowers in the guts or interior of the flowerhead, and large, showy flowers with large colourful sepals (tepals). These showy plants are often prolonged in a ring, or to the surface of the tiny flowers. Plants in untamed populations have few to nothing of the showy blooms typically, while cultivated hydrangeas have been bred and preferred to have significantly more of the larger type blossoms.There are two flower arrangements in hydrangeas with Corymb style inflorescens, which includes the commonly grown "bigleaf hydrangea"--Hydrangea macrophylla. Mophead plants are large circular flowerheads resembling pom-poms or, as the name suggests, the head of your mop. In contrast, lacecap flowers bear round, flat flowerheads with a center core of subdued, small bouquets ornamented by outer jewelry of greater plants having showy tepals or sepals.
The plants of some viburnums and rhododendrons can appear, at first glance, very much like those of some hydrangeas.Dirt and colors acidityIn most varieties the plants are white, however in some species (notably H. macrophylla), can be blue, red, green, light crimson, or dark crimson. In these types the colour is influenced by the existence of metal ions which can be found or tied up depending upon the garden soil 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 result in pink or red flowers.
This is the effect of a color change of the rose pigments in the presence of aluminium ions that can be taken up into hyperaccumulating plants.[6] Decreasing the pH of potting soils or mixes usually does not change the rose color to blue, because these soils have no aluminum ions. The ability to blue or pink a hydrangea is also inspired by the cultivar. Some plants are selected because of their 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 affected by aluminum and can't be changed or shifted. Hydrangeas also have a nickname called 'Change Rose'.
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