Helen Humphreys wrote:
How can I get rid of this monster that is trying to take over my whole
garden, spreading from a single clump in just three years? I was
naively ignorant, when I put it in, that it was intent on world
domination!! Digging it out seems futile, with such a fine-grained
root system.
Help, please!!

Graham Humphreys

digging it out will work well - it spreads mailny by self seeding not bits
of root.

pk