A grass-like herb that looks like a small scale pampas grass. Its wonderful lemon scent makes it excellent for making tea. If it freezes, which is often in all but tropical areas, just plant new plants each year. In addition to being one of the most delicious flavoring herbs, lemon verbena is a wonderful addition to the landscape garden as well as the herb garden. It will freeze, so it is best treated as an annual.
Mints make good landscape ground covers but they spread aggressively.
Mentha pulegium , pennyroyal, is reported to repel fleas. Common mullein or old man's flannel is a big wildflower that looks like a large, upright version of lamb's ear. Its flowers are yellow, white or purple depending on the variety. The strongest in flavor is Greek oregano, which is also an excellent ground cover plant. Excellent in sauces, soups and salads.