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countable and uncountable, plural comfreys
Any of several species of perennial herbs of the genus Symphytum, often specifically Symphytum officinale. quotations examples
It thrives on compost and natural fertilizers brewed from comfrey or seaweed and uses only rain, natural groundwater or wastewater purified through a system of reed beds.
2007 April 25, Kim Severson, “Farmer, Cookie Maker, Ecologist and, Yes, the Future King”, in New York Times