I planted a couple dozen this year, sheep ate em and they grew back immediately. They're prolific so I wasn't worried but them and comfrey are my favorite perennials to plant randomly in the pasture  

 Cool, I'll look more into comfrey. I don't have animals in my small city yard but I think it has other uses. 

 Medicinal, put in salves for burns and cuts.  

 Interesting, I hadn't heard that!