According to Mother Earth News, "many people have never heard of this fine herb, but it's been around for centuries. The Romans thought enough of the tall, aromatic plant to take it with them to England, and lovage was grown in medieval monastery gardens for medicinal, as well as culinary, uses. Dr. Samuel Johnson recommended the long-lasting perennial for rheumatism, while the American colonists brought it with them to make a favorite tea they hoped would help ward off the New World's aches and pains."
Both leaves and stems may be dried for winter use, too. To prepare the foliage for your spice shelf, just swish the stems in water, then clip off the leaflets and spread them out on a tray or newspaper until they're ready to be stored in airtight containers.
I did some research on the benefits of using lovage and found from several sources that lovage contains quercetin, which makes it a good garden remedy for allergies, respiratory problems, and is effective diuretic for treatment of urinary tract inflammation.
Kim and I did some testing with lovage this past season and we used lovage in place of celery in soup and we used the leaves where recipes called for celery seed. This herb is really awesome. Be sure to watch for it at our stand this season.