Invasive plant species


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Amorphous shrub (Amorpha fruticosa L.) is an allochthonous invasive shrub, native to southwestern North America. It was naturalized in Europe as an ornamental shrub, finding in time – invasive or aggressive nature.

The amorphous shrub was used to strengthen sloping and unstable slopes to achieve hedges and shelterbelts for protection against wind , combined with tree species of trees . It does not submit claims regarding soil , grows on degraded land , very poor , dry and sand.

The seeds are highly valued by some poultry species such as pheasant.

The plant produces relatively straight twigs and quite long , but less flexible , making them unfit for use for basket braiding . However the ingenuity of people from the flooded areas has found a use in making funeral wreaths skeleton.

As the time passed negative effects can be observed on the environment by the competition made to native species , which led to the elimination of some of them even in the areas affected.

Removal of amorphous bushes from natural habitats invaded the purpose of their regeneration is particularly difficult due to the prolificacy of the species , assuming also large financial resources.


The american maple (Acer negundo) or the maple ash tree is a large , fast-growing tree, native to central and eastern United States. It belongs to Aceraceae family.

It has composed leaves (that is unusual for maples) , consisting of three, five or seven leaflets grained irregular. It produces a dried fruit (Samara) that contains the seed.

The settlers from prairie areas in the United States prefer it because of its resistance to drought. American maple can get maple syrup and maple sugar. The wood is used in furniture manufacturing, pulp and coal.

Tree of North American origin, grown in street alignments where to wild, especially in meadows, but in recent years , we find that supplanted with Ailanthus altissima , almost all green spaces in towns and villages , especially in the lowlands . It has almost the same biological qualities as Ailanthus , that capitalizes much still young, growing rapidly and has deep rooting unlike Ailanthus.

Fallopia Japonica, also known as Polygonum cuspidatum or Reynoutria japonica is a perennial herbaceous plant that occupies most largely riparian ecosystems, causing serious damage to native vegetation. The species is listed in the top hundred most dangerous invasive plants by the International Union for Conservation of Nature.

One of the most dangerous invasive species of plants comes from Japan: Japanese weed with small knots, Fallopia japonica. It has a shorter stem, knotted, resembling the bamboo, but not related to it. Nature Conservation Commission, the UN has defined this plant that the greatest biological disaster of the twentieth century. The method of spread of this plant is not clear.

With deep roots and extremely strong, producing significant damage to roads, buildings, crops in Europe, America and Africa. With a high resistance to cold winters, the plant recovers after mowing, cut or after chemical treatment with herbicides.