The herb not only tastes good in culinary dishes, such as rosemary chicken and lamb, but it is also a good source of iron, calcium, and vitamin B-6. … Rosemary was traditionally used to help alleviate muscle pain, improve memory, boost the immune and circulatory system, and promote hair growth.
Herbs are plants that are grown either as a food (usually as a condiment), or because they have some use in treating diseases (or making them better), or for spiritual reasons (for example, their smell). Some herbs may act as an aphrodisiac.
The word herb comes from the Latin word herba, meaning grass, green stalks, or blades. Botanists use the word to mean any plant with soft, succulent tissues. But many people use the word to mean only herbs with some economic value.
Herbs are small plants that have a fleshy or juicy stem when they are young. The stems of some herbs develop hard, woody tissue when they grow old.
Most herbs are perennials. This means that the tops of the plants die each growing season, but the roots remain alive and produce new plants year after year.
Some herbs are annuals. They live for only one growing season and must be raised from seed each year.http://Wikipedia.com