Mullein (Verbascum thapsus ) was brought to this country by Europeans for use as a respiratory treatment. It’s now a common weed, easily identified.
From personal knowledge it is at least as good as OTC expectorants and syrups.
A heaping spoonful filtered (it has sharp hairs that irritate) into a cup of boiling water with a teaspoon of honey is very effective for colds.
“The combination of expectorant saponins and emollient mucilage makes the plant particularly effective for cough. All preparations meant to be drunk have to be finely filtered to eliminate the irritating hairs”
Got down to 22 degrees last night. Covered the cabbage which is just beginning to ‘head’ and the young lettuce. Didn’t cover the Fava beans but they seem to have survived alright along with the turnip greens.