Rita, that's what I have recently learned from this website the other day... But if kept under control, it's worth having.
Elaine, it amazes me how many varieties of basil there are, each having its own distinct flavor. Throughout my career, I've only used just a few of them & never have tried the rest. What I did this morning, was put my 2 basil plants in a shallow roasting pan (1 pot per pan) & watered the pan so the plant can soak up whatever it needs, whenever. I've only had these for almost a week already... And I haven't killed them yet, hopefully that is a good sign!