perennial Herb Plantharvest Leaves As & When You Requiresave Money, Not Buying Expensive Herb Jarsmake Your Herb & Spice Collection Work Harder When You Grow Your Own Fresh Plants On Your Own Plot. Tarragon Is One Such Perennial Herb You Can Enjoy. Grow In Containers Or In A Sunny Border.the Silver-green Foliage Has An Aniseed Taste and Is Most Often Used To Flavour Sauces (such As Béarnaise), Oils & Vinegars. We Like It Sprinkled On Baked Salmon. Its Delicious.an Herbaceous Perennial It Can Be Over-wintered In Mild Areas. We Recommend That You Have Horticultural Fleece To Hand When Frost Are Predicted In The Evening. Alternatively, If You Grow In Pots, Bring Indoors Overnight.