Thanks, sorry my comment about taking A. dracunculus to be either Russian or French was in reference to my having originally interpreted the tentative ID to mean it could be either since the accepted name is the same for both until one adds either the varietas or cultivar name for the French. For the purposes of a hedge, narrowing it down to being either would suffice, at least to start with. I've grown "French" tarragon before for cooking and remember having to be careful which tarragon to get and to not grow it from seed, but it is so long ago now that I couldn't remember how closely it matched the plant in the picture. If it's either of the Artemisia tarragons it's an interesting use for the plant and one that I haven't come across before. Trying to find something to make a low "parterre" type clipped hedge like that in USDA Zone 4 isn't easy!
