Found some brown seeds that I had for quite some time. Can't remember what they are, but they're growing nice.
What Kind of Tree Is This
Certified GKH Gardening Expert
This looks like a legume plant, perhaps a mimosa or locust tree seedling. If so, the seed that it grew from probably came in a pod and looked something like a bean (although many legume seeds are inedible or poisonous, so don't eat them!)