Rosemary is one of the more interesting herbs to grow. This is because the plant often grows as a small tree-like shrub with fir tree shaped needles or leaves, and the plant can be trained very easily, so they can be formed into interesting shapes. For instance, I've seen a potted rosemary plant as a Christmas tree.
Rosemary is semi-hardy and very fragrant. It does best in a light, fairly dry soil, though the roots should not be allowed to dry out completely, and the plant should be at least somewhat sheltered. Clay or chalky soils result in smaller plants, however they are also more aromatic. Rosemary does well in pots, provided they have enough root space for expansion.
This herb can be grown from seed, but the most common method of propagation is by cuttings. This is done by clipping branches that are about 8" long, in the fall, and putting them in damp soil to a depth of about 6". These tend to root easily.
Rosemary has been used for a very long time, medicinally, in food, and for it's aroma, in religious ceremonies. It is useful when used in dream pillows.
Medicinally, it is a stimulant, astringent, and tonic. It is also soothing to the stomach and has be successfully used to treat headaches. A tea made from the leaves or needles and plant tops is useful in treating colds and colic.
The needles can be dried and stored in jars with tight fitting lids or zip-lock bags, or the needles can be used fresh both in foods and medicinally. Dried rosemary should be stored in a cool dark place, and will remain potent for about a year. To dry the needles, place then on a screen and air dry out of direct sunlight, since sunlight can cause the aromatic oils to evaporate. However, a few sprigs tied together and hung in a room will result in a wonderful aroma, filling the room.
Rosemary oil is distilled from the plant commercially, and also has medicinal properties.
For foods, rosemary is a good addition to fish, lamb, salads, seafood, soups, vegetables, and tomato based sauces.
Considering it's very aromatic nature and it's value as an ornamental plant, rosemary is a worthwhile plant to grow in an herb garden or in large pots. It has good medicinal and culinary properties, so it has a wide range of uses. Try growing some, and see how many ways you can use the plant, and you will quickly see how useful it is.