How to Grow Comfrey

Follow these step-by-step instructions for starting comfrey from root cuttings or crown pieces.

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Growing Instructions

Choose a location.

Comfrey grows best in full sun to partial shade and well-draining soil. Choose a location that meets these requirements and has enough space for the comfrey to grow. Comfrey grows into a large, dense clump—about 2–3 feet wide and up to 3 feet tall, so make sure to leave enough space for it to grow without encroaching on your vegetables or fruit plants. If you are companion planting with fruit trees, you only need one or two plants per tree.

Prepare the soil.

Comfrey prefers rich soil that is high in organic matter. Amend the soil with compost or well-rotted manure before planting.

Plant the cuttings.

Outside: Work up a 12” by 12” area that is deep enough to accommodate the entire length of the root cutting. Plant the cuttings and cover with 2” of soil. 

Inside: Cuttings may also be started indoors or in your greenhouse before planting outdoors. They can be potted in 3" or 4" nursery pots and kept in a sunny location until you are ready to plant outside. Plant completely under the soil and keep the soil moist.

Water thoroughly.

After planting, water the cuttings thoroughly to settle the soil and ensure that the roots make good contact with the soil.

Mulch.

Apply a layer of mulch, such as straw or shredded leaves, around the base of the plants to retain moisture and suppress weeds. Leave the top of the root piece exposed so you can see the first leaves.

Care and maintenance.

Comfrey requires little maintenance once established. Water during dry spells and remove any weeds that may appear. Cut back the foliage during the summer and again in the fall and use it as a mulch around the plants.

Harvesting.

Comfrey can be harvested for its leaves and roots. For leaves, harvest when the plant is at least 12" tall and cut back to within a few inches of the ground. For roots, harvest in the fall or spring when the plant is dormant. Dig up the roots, clean them, and dry them for later use.