The infusion, also known as tea or more accurately a Tissane, is used for the above ground parts of plants such as leaves or flowers.
Simply cover the leaf or flowers with almost boiling water and allow to steep from 2-10 minutes, or up to overnight for a stronger infusion.
Traditional black tea is usually steeped for less time (2-3 min) to avoid drawing out the more bitter components.
For stronger Tissanes and a greater impact on health, let the steep of herbs go longer. Overnight steeping is often suggested by herbalists when looking for greatest therapeutic activity from the brew.
NOTE: If the water has come to a boil, let it “settle down” a couple of minutes before pouring over herbs, so it cools a bit. 170-185 degrees is the ideal temperature range for an infusion.