Other members of the Lamiaceae family include the garden herbs rosemary, thyme, sage, lavender, and catnip. You can tell them by their square stems. The leaves grow opposite each other with each pair at right angles to the one below. The flowers come in whorls at the upper portion of the stem.
The only problem I have with the plant, other than having to pull out all the little plantlets that spring up underneath it, is its attraction to whiteflies and by extension ants. This has only happened one summer and now at the first sign of an infestation I cut the stems back again. Washing the leaves down when I water it also helps to keep the insects off of it.