Nigeria has numerous tree species, of which the majority of them are native while few are exotic. A high percentage of man-made forests in the country is dominated by exotic species. This culminated from the assumption that exotic trees are fast-growing. However, studies have also investigated the growth of indigenous trees in with that of exotic species. Due to overexploitation, the remaining natural ecosystems and primary forests in Nigeria are restricted to the protected areas which include one biosphere reserve, seven national parks, one World Heritage site, 12 Strict Nature Reserves (SNRs), 32 game reserves/wildlife sanctuaries, and hundreds of forest reserves. These are in addition to several ex-situ conservation sites such as arboreta, botanical gardens, zoological gardens, and gene banks managed by several tertiary and research institutions