Aside from treating menstrual problems, tansy also is useful as a vermifuge, treating worms in children, and as a poultice to treat skin infections. Tansy is not a culinary herb as it has a very bitter taste. Tansy is a widely grown herb with a number of traditional medicinal uses, but needs to be used with an abundance of caution. It is used as an insect repellent. Use dried tansy in bags and pomanders to repel moths in clothes cupboards. Plant around the dog's kennel. A pot on the kitchen window sill will help repel flies and strewing the barbecue table with bunches of tansy leaves is a good idea. Add the leaves to the compost bin as they are rich in potassium. An infusion of the leaves can be used as spray to repel garden pests. reat skin infections.