Betty, I've always heard you use the dried leaves for this, I am hoping my clump will be big enough this year to make a batch
In 'The Encyclopedia of Medicinal Plants' by Andrew Chevallier, it lists the parts used as the leaves. Also, in 'The Healing Herbs' by Michael Castleman, he says the parts used are the leaves and flower tops. He says, 'For a cough-remedy infusion, use 1/2 to 1 tsp of dried leaves per cup of boiling water. Steep for 10 min. Drink up to 3 c a day. To offset its bitter taste, add sugar or honey. In a tincture, take 1/4 to 1/2 tsp up to three times a day. Horehound should not be given to children under age 2. For older children and people over 65, start with low-strength preparations and increase strength if necessary. Considered safe for healthy nonpregnant, nonnursing adults who do not have heart disease.
PatinMO
Shepherd's Glen Farm