Hydrangea (/ha?'dre?nd?i?/;common titles hydrangea or hortensia) is a genus of 70-75 varieties of flowering crops native to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. Undoubtedly the greatest species diversity is within eastern Asia, china notably, Japan, and Korea. The majority are shrubs 1 to 3 meters tall, but some are small trees, yet others lianas getting up to 30 m (98 feet) by climbing up trees and shrubs. They could be either evergreen or deciduous, though the extensively cultivated temperate types are deciduous.Having been introduced to the Azores, H. macrophylla is now very common, on Faial particularly, 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 increase in flowerheads (corymbs or panicles) frequently at the ends of the stems.
Typically the flowerheads contain two types of blossoms: small non-showy flowers in the guts or interior of the flowerhead, and large, showy flowers with large colorful sepals (tepals). These showy blooms are lengthened in a ring often, or to the exterior of the small flowers. Plant life in outrageous populations routinely have few to none of the showy blooms, while cultivated hydrangeas have been picked 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 flowers are large round flowerheads resembling pom-poms or, as the name signifies, the head of a mop. On the other hand, lacecap flowers bear round, flat flowerheads with a center core of subdued, small flowers bounded by outer bands of bigger plants having showy tepals or sepals.
The blooms of some viburnums and rhododendrons can show up, at first glance, just like those of some hydrangeas.Colors and dirt acidityIn most species the blooms are white, however in some kinds (notably H. macrophylla), can be blue, red, red, light crimson, or dark purple. In these species the color is afflicted by the occurrence of metal ions which are available or tangled up depending after 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 caused by a color change of the flower pigments in the presence of aluminium ions which is often adopted into hyperaccumulating crops.[6] Reducing the pH of potting soils or mixes usually will not change the flower color to blue, because these soils have no aluminum ions. The ability to blue or green a hydrangea is inspired by the cultivar also. Some plants are selected because of their ability to be blued, while some are bred and selected to be red, white or pink. The flower color of most other Hydrangea species is not damaged by aluminum and can't be changed or shifted. Hydrangeas likewise have a nickname called 'Change Rose'.
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