Probably one of the most useful, beneficial plants you can grow that has one of the worst reputations of any plant! In our 6 years of growing this plant, it has never spread unless disturbed. ...

Does comfrey spread easily?

They are hybrids of true comfrey and another variety called prickly comfrey. While true comfrey can spread easily, Russian comfrey has sterile seed, so it won't take over the garden. ... This is what really makes this plant a star in the permaculture garden: its ability to feed the soil with nutrient-rich leaves.

Is Bocking 14 comfrey invasive?

Between the self-seeding and root regrowth, comfrey can become invasive. There is a sterile species of comfrey, Symphytum x uplandicum 'Bocking 14', which eliminates the self-seeding problem in the garden. ... Wear gloves when cutting comfrey as the hairy leaves and stems can irritate skin. Fertilizer Uses of Comfrey.