This tool aids identification but does not replace an expert. Never eat a wild plant or fungus on the strength of a single feature. When in doubt, throw it out.
Great Mullein can be confused with 1 dangerous plant/fungus. Check every distinguishing feature before you trust an identification.
All parts contain heart poisons; the non-flowering leaf rosette is easily mistaken for comfrey, mullein or borage, and ingestion causes nausea, disturbed colour vision and dangerous, potentially fatal heart-rhythm disturbances.
Confusable part: First-year basal leaf rosette (the foraged leaf, used for tea), before either plant sends up a flower spike.
Foxglove is the dangerous look-alike for foraged soft-leaf rosettes: its poisonous first-year rosette resembles the plants people gather, and documented cardiac-glycoside poisonings have followed foxglove leaves eaten as comfrey or borage. Great mullein is foraged at the same woolly-rosette stage and grows in the same disturbed, sunny ground, so the same confusion applies. Foxglove leaves contain cardiac glycosides and can be fatal.
How to tell them apart
- Mullein leaves are densely, evenly woolly on BOTH surfaces — a thick silvery-grey felt that gives a soft blanket-like nap and largely hides the veins. Foxglove's upper surface is green and only thinly downy, never a thick silvery felt, and shows a sunken net of veins.
- Foxglove leaves have a distinctly toothed or scalloped margin; mullein margins are entire to only faintly scalloped. Use this only alongside the wool test, not on its own.
Look at the UPPER surface: a thick, even, silvery wool that hides the veins = mullein. A green, matte, net-veined upper surface (only thinly hairy) with a toothed edge = foxglove — do not use it.
Educational identification aid compiled from the Omnia Sana plant database and cited botanical and toxicological sources. Not medical advice and not a substitute for expert identification.