Hydrangea (/ha?'dre?nd?i?/;common brands hydrangea or hortensia) is a genus of 70-75 species of flowering plants indigenous to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. Undoubtedly the greatest types diversity is in eastern Asia, notably China, Japan, and Korea. The majority are shrubs 1 to 3 meters extra tall, however, many are small trees, yet others lianas getting up to 30 m (98 ft) by climbing up trees. They could be either evergreen or deciduous, although greatly cultivated temperate species are deciduous.Having been introduced to the Azores, H. macrophylla is very common now, on Faial particularly, which is known as the "blue island" due to the multitude of hydrangeas present on the island.Life cycleHydrangea flowers are produced from planting season to late autumn; they develop in flowerheads (corymbs or panicles) most often at the ends of the stems.
Typically the flowerheads contain two types of bouquets: small non-showy flowers in the center or interior of the flowerhead, and large, showy blooms with large colorful sepals (tepals). These showy blooms are extended in a ring often, or to the exterior of the tiny flowers. Plants in outdoors populations routinely have few to none of the showy bouquets, while cultivated hydrangeas have been decided on and bred to have significantly 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 blooms are large round flowerheads resembling pom-poms or, as the name signifies, the comparative head of your 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 flowers of some rhododendrons and viburnums can show up, initially, much like those of some hydrangeas.Soil and colors acidityIn most varieties the plants are white, but in some kinds (notably H. macrophylla), can be blue, red, green, light crimson, or dark purple. In these species the colour is influenced by the existence of light weight aluminum ions which can be found or tangled up depending upon the land pH. For H. macrophylla and H. 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 produce flowers that are blue to purple typically, whereas an alkaline soil (pH above 7) will tie up aluminum ions and lead to pink or red flowers.
This is caused by a color change of the bloom pigments in the existence of aluminium ions which may be adopted into hyperaccumulating plants.[6] Lowering the pH of potting soils or mixes usually will not change the bloom color to blue, because these soils haven't any aluminum ions. The ability to blue or pink a hydrangea is inspired by the cultivar also. Some plants are selected for 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 damaged by aluminum and can't be changed or shifted. Hydrangeas also have a nickname called 'Change Rose'.
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