If you want to kill them now, dig them up. If you want them to survive in pots, let the shoots grow up so that the culms can harden off; then wait until the plant is dormant (next winter or very early spring) and then dig up the root ball and pot. If you chop the roots right now, it's equivalent to cutting the umbilical cord months early. In the future, if you want to avoid shoots coming up where you don't want them, take a sharp shovel and chop all around the boundary you want to maintain, which will kill any rhizomes that are escaping too far. Usually this is done in the fall.

And your bamboo is probably Ph. aureosulcata. Does it look like this?

Here is a link that might be useful: Ph. aureo

Yes, exactly like that. Thanks for the response. I don't want kill it. I want it to grow south along my fence, but it seems to want to go east towards my house.

Well, if you make the divisions as I suggested you can force it to grow south. And if you live in a moderate Zone, you wouldn't have to pot them up. You could just take the division early next spring and replant it where you want immediately. What climate Zone are you in?

8 I think... North Seattle (wedgwood).

Steve-
The timing I suggested for you should work fine as I'm also in Zone 8. In fact, we're neighbors...I'm in Bothell!

thanks for the advice. if the bamboo doesn't creep much closer to the house I will leave it be until next year.

Steve-
Where it's coming up is probably the limit of creep for this year. Good luck.