I sure hope somebody here can help me. I love gaura - I've got 5 of them around my beds and I wish they were doing well but they aren't. They are totally infested with what I think are aphids. They are little tiny bugs sitting all along the stems...eating, I guess. WHAT can I do about them?

I don't like to use poisons but I will if I have to. Should I cut off the flower stems and treat the base plant? Should I spray the stems where the bugs are? HELP!!! Please.