Hydrangea (/ha?'dre?nd?i?/;common titles hydrangea or hortensia) is a genus of 70-75 species of flowering plant life local to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. Definitely the greatest species diversity is at eastern Asia, china notably, Japan, and Korea. Most are shrubs 1 to 3 meters extra tall, but some are small trees, yet others lianas getting up to 30 m (98 foot) by climbing up trees and shrubs. They could be either evergreen or deciduous, though the cultivated temperate types are all deciduous generally.Having been introduced to the Azores, H. macrophylla is now very common, on Faial particularly, which is recognized as the "blue island" because of the multitude of hydrangeas present on the island.Life cycleHydrangea plants are produced from planting season to late fall; they increase in flowerheads (corymbs or panicles) most often at the ends of the stems.
Usually the flowerheads contain two types of blooms: small non-showy plants in the guts or interior of the flowerhead, and large, showy blooms with large colorful sepals (tepals). These showy bouquets are extended in a band often, or to the surface of the small flowers. Crops in untamed populations routinely have few to nothing of the showy flowers, while cultivated hydrangeas have been bred and preferred to have more of the larger type flowers.There are two flower arrangements in hydrangeas with Corymb style inflorescens, which include the commonly grown "bigleaf hydrangea"--Hydrangea macrophylla. Mophead blooms are large rounded flowerheads resembling pom-poms or, as the name implies, the comparative head of any mop. On the other hand, lacecap flowers bear round, flat flowerheads with a center core of subdued, small blooms surrounded by outer jewelry of larger blossoms having showy tepals or sepals.
The bouquets of some viburnums and rhododendrons can show up, at first glance, just like those of some hydrangeas.Colors and garden soil acidityIn most species the flowers are white, but in some species (notably H. macrophylla), can be blue, red, green, light purple, or dark crimson. In these types the color is influenced by the presence of aluminum ions which are available 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 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 lead to pink or red flowers.
This is the effect of a color change of the blossom pigments in the occurrence of aluminium ions which may be taken up into hyperaccumulating plants.[6] Cutting down the pH of potting soils or mixes usually does not change the bloom color to blue, because these soils have no aluminum ions. The ability to blue or green a hydrangea is affected by the cultivar also. 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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