Assertion: comfrey | /r/HasProperty | cold
Facets:
Source sentences:
text: Comfrey is cold and heat hardy and can survive temperatures from -40°F degrees to 120°F.
text: Comfrey is cold hardy and grows in zones 3-9.
text: It is a cold-hardy perennial which becomes dormant and dies back in the winter and then re-emerges from it's tuberous root system in the spring.