WSU Extension

Hortsense

Weeds : Comfrey : Symphytum officinale
(revision date: 6/9/2014)

Family: Boraginaceae
Cycle: Perennial
Plant Type: Broadleaf

Use Integrated Pest Management (IPM) for successful weed management.

Biology
Comfrey has clump-forming perennial roots with brown to black bark. The roots are thick and penetrate deep in the soil, making comfrey difficult to eradicate once established. Plants are from one to three feet tall. Leaves are thick and broad, growing primarily from the base of the plant, and are roughly hairy on both upper and lower surfaces. Lower leaves may exceed eight inches in length. Flowering stems rise from the center portion of the plant and bear somewhat inconspicuous dull bluish-pink (sometimes white, cream-colored, or purplish), bell-shaped nodding flowers. Fruits consist of four glossy, brownish-black nutlets or seeds joined at the base. SPECIAL INFORMATION: Although comfrey has a long history of both food and medicinal use, it should not be taken internally. The plant contains a toxic substance which can cause chronic liver damage. Comfrey may be confused with purple foxglove (Digitalis purpurea), which is toxic.
Habitat
Comfrey is most often found spreading from sites where it was introduced as an ornamental or herb. It prefers moist, rich soils and can be found in meadows and waste places.

Management Options

Non-Chemical Management
None recommended
Select non-chemical management options as your first choice!

Chemical Management

Apply according to label directions. Not a problem in established turf areas. Glyphosate products should be applied as spot treatments only! NOTE: Some ingredients listed here are only available in combination. Read the label carefully on combination products to make sure the product is suitable for your specific situation.

Landscape areas
  • glyphosate
Turf areas
    Bare ground areas
    • glyphosate
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    Caption: Comfrey bell-shaped flowers
    Photo by: T.W. Miller
    Caption: Comfrey leaf
    Photo by: T.W. Miller
    Caption: Comfrey bell-shaped flowers
    Photo by: T.W. Miller
    Caption: Comfrey in waste area
    Photo by: T.W. Miller
    Caption: Comfrey hairy stem
    Photo by: T.W. Miller