Strange plant that has appeared in my flower garden

I have a new plant that popped up.  I didn't plant it.  Very large leaves with a strong main stem and very large leaves.  Along the stem at leaf bracts a small insignificant yellow flower blooms.  I am afraid it is something bad so am cutting off the seed pods before they mature.  Can you help identify it.  Is is almost 2 feet tall now .      firelookout