Lavender is another one good for headaches, as well as for promoting natural sleep. Basil can be used for stomach problems and to ease coughs. Lemon Balm tea will relieve cramps. Lemon Verbena tea is very sedative. Catnip tea is very soothing for children, and helpful for insomnia.
Rosemary tea is scholar's favorite, as it aids in clear thinking and helps memory.
The time to boil things is usually when you are using hard stuff. No, not that kind of hard stuff. Hard stuff like roots and bark. Start with the roots or bark or items chopped into small pieces and simmer them gently, with the lid on, for about ten minutes. This process is known as making a decoction.