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RE: Do you want to make your own natural liquid fertilizer? One that is especially rich in potassium and perfect to encourage flowers and fruit set?
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.