14.Speedwell
Speedwell, or Veronica, is a large family of flowering perennials that grows in many beneficial habits, including low ground cover and large, spikelike flowers reminiscent of salvia. Although a few members of the genus are considered weeds, most can easy to expand within the desired area.
Consult your nearest gardening center to ensure that the variety you want doesn't grow too quickly. You can get too much of a good thing, just like everything else!
