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Utah State University Extension
Comfrey (Symphytum officinale) is a very hardy perennial herb adaptable to most conditions. Comfrey grows best in partial to full sun in moist, fertile soil. Comfrey is propagated by root cuttings or crown divisions. Comfrey can be planted throughout the growing season but establishes best when planted in the spring. Maintain moderate soil moisture, especially when plants are young. Once established, comfrey outcompetes weeds and does not have any reported insect or disease issues in Utah. Some leaves and roots are harvested after the first year of growth. It should be noted that consuming high doses or excessive long-term ingestion may cause liver toxicity, and those with known liver issues should consult a doctor before ingesting comfrey.
Rolfe, E., & Drost, D. (2023). Comfrey in the garden [Fact sheet]. Utah State University Extension.