Posted: 31/07/2015 at 16:40
I also in the process of removing a bamboo which, after years of being beautifully behaved, has decided to make a break for freedom. Fortunately I can get all around it but it's still b***** hard work getting it out.
In case it's helpful to others with large bamboo clumps, this is my method -
Cut the stems down to ground level. This will enable you to see any gaps between clumps.
Trench around each clump with a mattock and cut any underground stems.
Undercut the clump with a pickaxe
Finally chop each clump into sections with an axe and prise sections apart with 2 forks back to back.
Once the clumps are removed you should be able to trace any runners. They aren't generally more than a few inches below ground so aren't that difficult to follow if they are running through the garden or under a lawn as mine are. I am having to lift some turf, but it is important to remove as much as possible.
I did try Roundup Gel on some of the new growth but there is no evidence of it having any effect at all.