I will have to research which horsetail, and I do have a bit of worry about possibly introducing an invasive. Even though this would be an indoor plant, it is my understanding that horsetails are quite easily transported via their spores sticking to shoe bottoms, etc. I currently don't have any in my yard, or even on our property (that I know of) although it does grow in the roadside ditches. I could also do a bamboo of some sort. Looking for a strong vertical line.
