Knotweed and Tulips

I like this photo because of the contrast between the tulip (Tulipa sp.), cultivated for centuries and very well-behaved, and Japanese knotweed (Fallopia japonica), cultivated for over a century but very unruly indeed. You could try to give it a "time out" in the corner but you know it wouldn't stay there :-). Photo was taken at the UMass Boston greenhouses...by now the tulips have shed their petals and the knotweed has long since shaded them out anyway.