We harvest flowers and upper stems. The perennial roots will grow back if aboveground parts are harvested. This is the most ecological method if the species is strong enough. Root harvest requires thought for the continuation of the stand, but it can be done without difficulty. If harvesting for drying, harvest young flowers or buds as they go to seed quickly during the drying process.
Fresh herb is best for tincture.
Fresh plants may cause an oil to go rancid from too much water, so either wilt or dry the herb. Increases blood flow to the area, without the warming effect of other counterirritants. Do not use on broken skin. Always check label to be sure it's homeopathic. Tinctures are used topically for oily problems, oils for dry problems.