As a followup, I read up on the different kinds of comfrey, found three wild plants in my yard and then decided to order a crown of the Russian Bocking 14 from a seller on Etsy who had good ratings from the past month. I started thinking about what would happen if I tried to propagate heirloom comfrey by seed and thought I might have a tough time rescuing everything else from it considering I recognized it right away when I went out in my small suburban back yard and immediately found it. I've pulled a lot of comfrey plants in my life, it turns out!
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The sterile variety such as bocking 14 will not spread by seeds. I like that about the sterile variety, that way I don't have comfrey showing up everywhere that's unwanted. I purchased all my comfrey from Coe's comfrey. I have ordered from other sources before and not happy with them. Coe's comfrey always gives me extra root cuttings for free with each purchase.