I've had this plant for going on four years now. It's survived hail, excess water, snow, heat, everything. It dies off in winter to just a stem, then the leaves come back. This is as tall as it gets (about 8 inches) and it never flowers. I've had it in partial shade, complete shade, and this year, complete sun (8 hours). I may - MAY - have bought it as a yellow lilac years ago from Publisher's Clearing House and maybe that's what they actually shipped me. Who knows? But this plant did arrive with another plant planted right next to it and that turned out to be a butterfly weed which looked totally different and which I planted in my garden bed. That has since grown and bloomed. Meantime, if anyone knows what it really is, I'd be grateful. This picture was taken in the spring. Please ignore all the weeds around the pot. I have those (mostly) gone now. For a better size reference, that's a half barrel next to it.
Oh boy the leaves in the pot growing is a tricky thing to try to ID. For me a pic of just a few leaves is like trying to ID the age of someone from a picture of a just toe. Maybe someone else can help. Good Luck.
I was afraid of that but the plant never grows any taller. I'd toss it, but I keep hoping it will flower some day. This is a spring picture of it. I have another shot of it in my other thread here "Junipers or cedar trees?" It's not as clear, but the leaves have gotten larger.
Like Pac said, no telling what it could be. What I would do is plant it in the yard. Take a look at the roots and see what you have in that pot. It might be that once it can spread it's roots out, it'll grow and then, if it does flower we can have a better chance at IDing it.