Thank you very much for the link, Melanie. I am new to the world of butterfly watching/sighting. I registered and posted my sighting and photo at that website and am now waiting for a notice of acceptance or rejection.
My butterfly bushes are all Buzz series plants. They are considerably smaller than most butterfly bushes. Last year I planted two and soon saw an orange monarch. I was so smitten that I planted 22 more this year and love every one. So far, the two that I planted last year have not produced offspring. But I will proceed cautiously based on your warning.