Making An Infusion Making an infusion means extracting with water (as making a tincture means extracting with alcohol). There's two types of infusions: cold infusion and hot infusion. - Cold infusion means that you pour cold water on the herb and let it stand for long enough for the herb's constituents to be dissolved in the water. - Hot infusion is the same but with hot water. Usually hot infusion is called herbal tea. I sometimes talk about "standard infusion". By this I mean two heaped teaspoonfuls of dried herb in a cup of hot water, let stand for 10-15 minutes. Have you used the above yourself often? Not lately, because I haven't found horsetail around where I live nowadays. When I was a kid, I learned this from my mother. We sprayed our blackcurrant bushes with horsetail- water. A few years back I sprayed my lovage and mints with horsetail-water. - M