Easy to grow, herbs add flavor to recipes and salads—and many have health benefits. When choosing what herbs to buy, check and see 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 are the herb's height, sun requirements and harvest time. Also, some herbs for sale are sold as seeds while others are sold as plants. 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. It's always fun to grow your flavor favorites.