The Jamrose is present in multiple ravines, especially in the humid forests where this tree is gradually expanding to the detriment of the native flora.
Introduced on La Réunion in 1825, it was frequently planted on the slopes to retain the soil. It has then ascended along the ravines where it has formed layers in gallery form which it now dominates. It can also be found in lowland rain forest and in agricultural areas in the North and East mainly.
It has been shown that the Jamerosat is very invasive to native vegetation. It suffocates them by forming almost monospecific colonies. It spreads itself very easily in environements which are even slightly degraded and then forms a very dense mantle creating a considerable shadow which prevents the regeneration of the native flora. It can thus become dominant and modify the natural succession of plant species.
On La Réunion, it progresses along the ravines (Massif de la Montagne). It is gregarious and grows in very dense and probably alllopathic communities (those whch prevent the regenation and development of other species by chemical and mechanical means).