Skullcap — American (Scutellaria lateriflora) – hardiness zones in USDA, RHS, Canadian & Australian systems

Slender mint-family perennial of moist North American woodlands. Aerial parts traditionally used as a calming nervine.

Hardiness ratings

Skullcap — American hardiness across the four zone systems
System	Rating	Temperature range	How to read it
USDA hardiness zone	Zone 4–8	−34.4 °C to −6.7 °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 4–8	−29 °C to −1 °C	Plant tolerates down to this zone
Australian (ANBG) zone	Zone 1–4	−15 °C to 5 °C	Plant tolerates down to this zone

Do not confuse with germander skullcap (Teucrium chamaedrys), which is hepatotoxic and historically misidentified in commercial herbal supplies
Tolerates partial shade and damp ground
Always consult a qualified medical or herbal practitioner before using any plant medicinally