Herb plants are some of the easiest plants to grow in the home garden and a favorite for beginning and experienced gardeners. Not only do herbs add flavor to recipes and salads, they also have many health benefits. When choosing what herb seeds and plants to buy, determine if they will grow in your hardiness zone. Some herbs are grown as annuals while others are grown as perennials that return year after year. Other considerations when selecting herbs to buy online are the herb's height, sun requirements and harvest time. Choose from herb plants and seeds. Herb seeds are economical, especially if you want to grow a lot. If you only want to grow a few herb plants, then plants may be the best option. Finally, consider herbs that you like to use.