Yes, it is a nasturtium.  Because Christine was correct and because she likes nasturtiums so much, I will post a couple more nasturtium pictures.  Like Christine's nasturtiums, mine also are growing very well. 

Yesterday I forgot to tell you what I intended to do with the new shepherd's hook pot hanger.  I put it out in the garden near the sunflower and hung my hummingbird feeder from it. 

During the past few days, I noticed that the humming bird checked out the two empty feeders we had out during the winter.  Since he knows they were not for him, I decided he needed a new place for his feeder.  And, what better place than near the sunflower he likes to visit. 

Shortly after I put the feeder out, the humming bird homed right in on it.  The humming bird returned this morning.  We believe it is one humming bird and it has discovered a private feeder and that st least for now, he is keeping it a secret.