Wild Elderberry...the one with the red berries. Get it out of your bed as soon as possible. You cut it down and it want's to grow back for years! The birds drop the seeds everywhere.

Thanks! I figured I'd better address it before it actually blooms. I'll take it out tonight.

Forms dense thickets if left on it's own. It would be safe to leave until the fruit turns red, but the roots are probably getting stronger by the minute.

You'd be better off with Nandina for occasional red berry clusters.