This is Ocimum gratissimum, also known as clove basil, African basil, wild basil, and West African Basil. The leaves that grow on this plant are known a scent leaves. This is in fact a common herb in West Africa. It is also used by people in the Caribbean. This plant can get about 8 feet tall and is extremely fragrant giving off a basil-clove type of fresh smell. You could bring this plant inside to a garden window for the winter. You can pick the delicate white flowers and use them in a salad, This plant is grown as an annual everywhere, and is a tender perennial is USDA Hardiness Zones 10 to 11