[qup]

I have a few that are over a year old now that I noticed and plan to take care of soon.

Can you summarize what you've learned?

[rch]

The most effective method was to hack into the bark to apply an herbicide, and give it a couple of weeks to make its way into the roots. Dig out as much as you can once the leaves all die. Good luck!

[qup]

Thanks!