Argiope trifasciata (Forskål, 1775) Discussion

Found in my front yard this morning

lat 38.73875369983168

long -104.18862819671631

My yard has peppermint, applemint, tricolor sage, buffalo grass, mums, lillies, columbine, irises and some other garden type flowers.  I also have rhubarb.  I have been here 12 years and this is the first of these spiders I have seen.  I also was able to get a great pic of the underside.  A 2nd web was discovered 30 minutes later about 2.5 feet from the 1st one and it had another female about the same size.