In the herb store, choose fresh organic basil over the dried form of the herb since fresh leaves are always superior in quality and flavor. Basil leaves should feature deep green leaves and free from dark spots or yellowing. Dry basil leaves and seeds can be found in these stores. However, sun dried as well as radiation-treated basil leaves may contain significantly decreased vitamin-C and carotene levels.Fresh basil herb should be stored in the refrigerator set at appropriate humidity. Dried basil should be kept in a tightly sealed glass container in a cool, dark and dry place where it will keep fresh for up to six months.