Life Span
Type
Origin
Types
Number of Varieties
Habitat
USDA Hardiness Zone
AHS Heat Zone
Sunset Zone
Habit
Northeastern United States, Mid-Atlantic United States, Southeastern United States, North-Central United States, Central United States, South-Central United States, Southwestern United States, Canada
Bluffs, stream banks, Wet forest, Woods
1a, 1b, 2a, 2b, 3a, 3b, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20
Symphytum officinale (common comfrey), Symphytum asperum (rough comfrey)
Cold Regions, stream banks