How to Prune commonName:"comfrey 'Rubrum'"?
Generally not required but old or fading foliage can be trimmed

commonName:"comfrey 'Rubrum'" · Symphytum 'Rubrum'
Grow in sun or partial shade in moist, moderately fertile soil. Spreading in habit but should be less of a nuisance than some other very vigorous Symphytum species
Generally not required but old or fading foliage can be trimmed