So if I buy comfrey seeds those will probably propagate and become a problem but with blocking comfrey roots won’t propagate on their own?
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I have some of the bocking comfrey. It is easy to split and propagate. I have not tried growing from seed
Right you have to propagate it cuz it only produces sterile seeds?
Ive never got any seeds. It flowers, I'll check this year for seeds
Bocking 4 and 14 are inert. They only propagate through roots. They stay where you plant them. Make sure you put them where you want them as well, because they do stay.
Thank you!
Any time man
Yes. Only use root cuttings from Bocking 4 or 14. They are sterile and can’t produce seed. You can propagate comfrey just by root cuttings.
Here is a guide: 
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Thank you!
Lol i just transplanted a ton of comfrey to a wet spot in the lawn this morning.
Im not trying to deal with weedeating johnson grass around spray heads all summer.
Nice