Grow it: This sweet, fragrant annual is ideal for growing in pots. Pull off the white flowers as soon as they appear to keep it from going to seed and your herbs from tasting bitter.
Use it: Rub crushed leaves on your temples to relieve headaches. Pour boiling water over basil leaves for a pain-relieving footbath.

How to grow
Plant seed outdoors when frosts are over and the ground is warm, start indoors in individual pots, or buy bedding plants. If you start plants indoors, heating cables are helpful, since this is a tropical plant that doesn’t take kindly to cold. Plant in full sun, in well-drained soil enriched with compost, aged manure, or other organic materials. Space large-leaved cultivars, such as ‘Lettuce Leaf’, 1½ feet apart and small-leaved types such as ‘Spicy Globe’ 1 foot apart. Basil needs ample water. Mulch to retain moisture after the soil has warmed. Pinch plants frequently to encourage bushy growth, and pinch off flower heads regularly so plants put their energy into foliage production.
 
Grow a few basil plants in containers so you can bring them indoors before fall frost. Or make a second sowing outdoors in June in order to have small plants to pot up and bring indoors for winter. As frost nears, you can also cut off some end shoots of the plants in the garden and root them in water, to be potted later.
 
Basil can be subject to various fungal diseases, including Fusarium wilt, gray mold, and black spot, as well as damping-off in seedlings. Avoid these problems by waiting to plant outside until the soil has warmed and by not overcrowding plants. Japanese beetles may skeletonize plant leaves; control pests by hand picking.
 
Harvesting
Begin using the leaves as soon as the plant is large enough to spare some. Collect from the tops of the branches, cutting off several inches. Handle basil delicately so as not to bruise and blacken the leaves.
 
You can air-dry basil in small, loose bunches, but it keeps most flavorfully when frozen. To freeze basil, puree washed leaves in a blender or food processor, adding water as needed to make a thick but pourable puree. Pour the puree into ice-cube trays and freeze, then pop them out and store them in labeled freezer bags to use as needed in sauces, soups, and pesto. Pesto (a creamy mixture of pureed basil, garlic, grated cheese, and olive oil) will keep for a long time in the refrigerator with a layer of olive oil on top.
 
Uses
This widely used herb enhances the flavor of tomatoes, peppers, and eggplant. It is great in spaghetti sauce, pizza sauce, and ratatouille. It’s also excellent for fish or meat dishes, combining well with lemon thyme, parsley, chives, or garlic. Try it in stir-fries or in vegetable casserole dishes. Fresh basil leaves are delicious in salads. Try the lemon-and lime-scented cultivars in fresh fruit salads and compotes. Basil is also a staple ingredient in Thai and Vietnamese cuisine; cultivars such as ‘Siam Queen’ give the most authentic flavor to these dishes. Basil vinegars are good for salad dressings; those made with purple basils are colorful as well as tasty.