Plantain — Ribwort (Plantago lanceolata) – hardiness zones in USDA, RHS, Canadian & Australian systems

Narrow-leaved cousin of broadleaf plantain. Traditionally used as a respiratory expectorant and for soothing sore throats.

Hardiness ratings

Plantain — Ribwort hardiness across the four zone systems
System	Rating	Temperature range	How to read it
USDA hardiness zone	Zone 2–10	−45.6 °C to 4.4 °C	Plant tolerates down to this zone
RHS hardiness rating	H7	down to −20 °C	Plant needs at least this level of cold tolerance
Canadian plant hardiness zone	Zone 2–9	−40 °C and warmer	Plant tolerates down to this zone
Australian (ANBG) zone	Zone 1–6	−15 °C to 15 °C	Plant tolerates down to this zone

Host plant for several British butterfly species including the Glanville fritillary
Always consult a qualified medical or herbal practitioner before using any plant medicinally