Horse tail? Bamboo? What might this be?

I found this growing in my black bamboo pot.
This is my first spring with the bamboo but I don't think new bamboo shoots grows like this.
Reminds me of Horsetail...

What do you guys think it might be?

 

Looks like a Horsetail.

 

Definitely Horsetail.

Kind of an annoying weed, but if you can collect enough of it, it makes a pretty good hair conditioner!

 

Field Horsetail Equisetum arvense. Unfortunately, the most aggressive and most difficult to control horsetail.

 

Yes. It is fortunate Imperfect Ending has it only in the pot.

 

Produces spikes with spores early in the year, making it possible for it to get out of the pot. Characteristic of sites with moist yet poor soils, can be crowded out with tall, dense ground covers. Coal age plant not so easy to kill with chemicals, as is indicated by it being pretty much the only growth on parts of the toxic piles remaining from the Tacoma smelter.

As with giant morning glory (another local curse) you must keep snapping the young tops off each time they appear, to have much hope of suppressing it. Although it is possible to get most of the roots of the morning glory if you keep at it, the horsetail is very hard to dig out.