Lemon verbena is very lemony, with pretty narrow leaves that make a lovely pale-green tea. It's the one for drinking before going to bed and will help send you to sleep...
Chamomile
Chamomile tea has a wealth of uses. It calms the nerves and is often used as a mild sedative. While not as strong as prescription sleeping pills, chamomile soothes the nervous system and relaxes the user. Chamomile will also soothe digestive pain and stomach problems, eases symptoms of the common cold and flu and is also said to relieve menstrual cramps.
Note that pregnant women should not drink chamomile tea. In large doses it harms the fetus and causes miscarriage. Anyone allergic to chamomile tea should also avoid it and its extracts.
Lemon Balm
Despite its similarity in taste to Lemon Verbena, lemon balm has the opposite effect to verbena. It relieves tiredness and is a useful morning-after pick-me-up. It's also good for tension and headaches, and studies have shown that it helps restore memory.
Peppermint
Peppermint tea is a lively and refreshing drink reputed to aid digestion. The drink is naturally caffeine free, making it a wonderful alternative to tea and coffee. Spearmint is one up from peppermint, perhaps a bit stronger. Both are excellent for indigestion and colds.