Comfrey plant roots1/11/2024 Their high potassium content makes them beneficial for tomatoes, potatoes, peppers and cucumbers as well as berries and fruit trees. Frequently, the plants can grow to a height of 3 to 5 feet.įreshly-cut comfrey leaves make good mulch as they have a high nitrogen content (17%). When comfrey plants get about two feet tall they can be harvested by cutting the plant to 2 inches from the ground. The following year, allow the plants to flower at least once during the season to provide the high nectar fodder popular with honey bees and other pollinators. The plants should be allowed to establish well-developed roots the first year. It needs to be divided every few years to keep the plant healthy with plenty of space for the root system. Comfrey is cold hardy, dying back in winter and returning again in spring. The herb can be grown from seed and cuttings, but grows best from bare-root crowns started in a pot rather than directly in the garden. However, the best yield occurs in soils with a pH of 6.0 to 7.0. Russian ComfreyĬomfrey prefers moist, fertile soils but adapts to many soils with a pH of 6.5 to 8.5. These nutrients are relocated throughout the plant giving the leaf biomass a great balance of major plant nutrients (nitrogen, phosphorous, potassium). They have deep roots which allow comfrey to access the nutrients from deep in the subsoil that normally remain inaccessible to other plants. The species : Symphytum officinale known as common comfrey, and the Russian comfrey, Symphytum uplandicum, are grown in the Edible Garden. It is not grown for food in the Edible Garden, but for its unique use as a dynamic accumulator as well as a pollinator attractor. By Tony Jevans and Cliff Keller Common ComfreyĬomfrey, genus Symphytum, is a perennial herbaceous shrub originating from Eurasia with more than 35 species.
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