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Perennial is a term with origins back to latin perennis. It is an adjective that relates to that incessant, recurring or continuous. Examples: "poverty is a perennial problem in Latin America", "success is perennial in this club", "I won't let this become a perennial problem for us.
For Botany, plants perennial (or perennial) are those which are persistent, that is, who live more than two years. Herbs (so-called weeds) found in nature are an example of perennial plants.
The word is also used to designate plants whose foliage remains green during all seasons. This means that these trees or shrubs have still living leaves unlike deciduous trees whose leaves die each year to then germinate again.
In the case of perennial plants, the leaves live more than one season, so younger joined the news and that the tree is never naked, although the old leaves eventually fall.
In addition, perennial (or eternal) philosophy is the current of thought which supports the existence of a universal set of values that are common to all cultures. It is Agostino Steuco who proposed this concept in a book of 1540. Later, Gottfried Leibniz and Aldous Huxley took over this idea.
The principles of the perennial philosophy argue that the physical world is not the only reality, but has another (non-physical) that cannot be perceived by the senses. The man is therefore a reflection of this double reality, with a material body governed by physical laws and others related to the mind and the intellect.