Hydrangea (/ha?'dre?nd?i?/;common titles hydrangea or hortensia) is a genus of 70-75 kinds of flowering plants native to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. By far the greatest types diversity is eastern Asia, china notably, Japan, and Korea. Most are shrubs 1 to 3 meters large, however, many are small trees, as well as others lianas reaching up to 30 m (98 ft) by climbing up trees. They can be either deciduous or evergreen, though the widely cultivated temperate varieties are all deciduous.Having been introduced to the Azores, H. macrophylla is very common now, on Faial particularly, which is recognized as the "blue island" due to the multitude of hydrangeas present on the island.Life cycleHydrangea blooms are produced from planting season to late fall; they increase in flowerheads (corymbs or panicles) most often at the ends of the stems.
Typically the flowerheads contain two types of plants: small non-showy flowers in the guts or interior of the flowerhead, and large, showy bouquets with large colorful sepals (tepals). These showy flowers are often lengthened in a engagement ring, or to the exterior of the small flowers. Plant life in crazy populations routinely have few to none of them of the showy flowers, while cultivated hydrangeas have been chosen and bred to have more of the larger type bouquets.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 signifies, the comparative head of an mop. In contrast, lacecap flowers bear round, flat flowerheads with a center core of subdued, small flowers encircled by outer jewelry of bigger blossoms having showy tepals or sepals.
The flowers of some viburnums and rhododendrons can seem, initially, a lot like those of some hydrangeas.Garden soil and colors acidityIn most types the blooms are white, however in some varieties (notably H. macrophylla), can be blue, red, red, light crimson, or dark crimson. In these kinds the colour is damaged by the presence of metal ions which can be found or tangled up depending after the dirt pH. For H. h and macrophylla. 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 produce flowers that are blue to purple typically, 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 blossom pigments in the presence of aluminium ions which can be adopted into hyperaccumulating vegetation.[6] Cutting down 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 influenced by the cultivar. Some plants are selected because of their ability to be blued, while some are bred and selected to be red, pink or white. The flower color of all other Hydrangea species is not afflicted by aluminum and cannot be changed or shifted. Hydrangeas also have a nickname called 'Change Rose'.
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