What is this?

{{gwi:258282}}

{{gwi:258283}}

I assume it's shade loving, since I have about 10 of them thriving on the North side of my home under the front porch's rather long overhang. The leaves have a sharp needle-like point that can jab or scratch you good if you're not careful.

I do practically nothing for them and they pretty much take care of themselves. Occasionally the leaves on one or another will brown up and fall off, only to burst forth with new leaves. If I recall, they stay green even during early 2011's hard winter.

But there is one of these plants at the far East end that get's quite a bit more sun and looks like a sickly twig next to the others. I'm wondering if there is anything I can do to help improve it.