We collected a load of elderflower heads today, with the intention of using it to make cordial. Unfortunately, greenfly like elderflower even more than we do. Having recently washed all our potted herbs to prevent an infestation we didn't want these newcomers to ruin all our hard work, or our cordial for that matter, so we rinsed the whole lot, stem by stem, in the bath. Fortunately the debris looks pretty (see above) and our bathroom now has a pleasant floral aroma.