Awesome,

There's a few varieties of note:

Classic Comfrey: prolific and spreads - propagates from seed and root

Bocking #4: sterile seed, only propagates from root

Bocking #14: sterile seed, also only from root

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I have the bottom two varieties of you need 🫡.

If you don't mind it spreading, which be mindful once comfrey is there it's almost impossible to kill, then go classic.