Mints have a square stem and opposite leaves.
The stems can reach two to three feet high and produce small flowers in late summer. Space plants 3 feet apart and divide often to prevent aggressive spreading. You can also plant mints in sunken containers to slow down their spread. Water to keep the soil evenly moist and fertilize lightly to encourage maximum flavor. Note that species of mint interbreed easily, forming many hybrids that blur distinctions between species.