You're probably having trouble sprouting the comfrey because your seeds are probably Bocking #4 or #14 and the seeds are Sterile. Is this seed from your own plants or plants of others?
Discussion
These were seeds ordered online. If I had one come up I’d divide myself. Tried cold strat, scoring, indoor, outdoor. Received a couple packs from different batches so don’t think it was a bad batch.
Hmm. I’ve got some I might be able to send your way. I would probably have to ship, but maybe other arrangements. Feel free to direct message and we can hash out details.