Is your basil thriving? To preserve summer herbs for winter soups and stews, make herb cubes in the freezer. Chop up your herbs and place them in ice cube trays, then cover with water and freeze.
To preserve the color and flavor, use boiling water to fill the tray (this blanches the herbs).
Some herbs, like cilantro, keep better when frozen in oil. Mince the herb in a food processor, then introduce olive oil until you produce a fine puree. Pour into ice cube trays or bags and freeze.
When introducing the frozen herbs to recipes, remember that they contain water or oil. If this will throw off the recipe's consistency, thaw and drain the cubes first.