it is also excellent fiberous food for chickens and rabbits. Luscious leaves and amazing beautiful blossoms. they do not do well in containers, as their roots need to go very deep (like their cousins dandelions). I think a 5 gallon pot without a bottom and buried in an area, may prevent the spread. I have not had any luck with seed sprouting, maybe as my birds eat the flowers before the seed matures.
I visited an amazing demonstration garden here and their 100 y.o. orchard ground is covered with ancient comfrey. By the end of the summer, without watering, the comfrey dies back and the leaves wilt forming an amazing ground cover. it desintegrates rather quickly feeding the soil for the trees.
I have blue and lavendar blossoms. Still young but would love to trade for other colors also. If you have any spare, lets trade. I got my plants for free from my community garden and by walking by and asking garden owners for it.
It is an amazing plant, in Brazil, in rurual places, it is used to wounds and other skin illness. the leaf is 'steamed' and applied directly on the area. Some even claim it cures stomach ulcers for its healing proprieties. Well, I like it very much and think we all should have some.
On the same topic, I wonder if anyone tried 'crimson clover' among baby fig trees. I wil post a separate post to show what I mean.