Mature Mimosa Trees?

[DisEmboDied]

How mature must a mimosa tree be before one can harvest the magic out of the root bark?

I have a couple in my yard, but they are only like 4 inches around, but are probably around 20 ft. long....

 

[Mister_Niles]

Have they been positively identified as Mimosa Hostilis?

 

[DisEmboDied]

Yes they have