I've got a Comfrey patch established and will be adding more.
Once established, it can be harvested every three weeks.
It comes back every year. (Mine didn't even go dormant last winter)
All it requires is water and chicken manure to thrive.
So if the SHTF, I'll be able to sustain my flock and eat the roosters.
Of course, they'll be a lot of bandits attempting to steal your birds.
Bonus: I make new plants from root cuttings and they sell well.
It's also fabulous for making an ointment that is great for many skin ailments.
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