Depending on how and where you grow them, herbs can be either annual or perennial. What usually separates them from other plants in the garden is that herbs can be used to enhance your meal, but are not usually served as dishes by themselves, such as fruits or vegetables. As such, many of them can be seen growing in kitchen windows. In addition to their uses as spices, many herbs have other useful properties: medicinal, attractiveness, sachets, pest repellant and ground cover. Some herbs grow so well that they are considered weeds or invasives.