Biennial. Moss Curled parsley is an herb you can always depend on. Because of its cold hardiness, it is available to harvest much of the year — even in the coldest of climates. Milder flavor than flat-leafed types. Remember, parsley is not just a garnish! It is a very nutritious herb (vitamins A, B, C), does a great job of blending food flavors, and freshens your breath!