In search of blue beans

In the late summer, early fall I "harvested" a couple of pods off of a bean plant my son had planted in the backyard. The plant must have been attractive to rabbits because he was grazed on throughout the growing season. When it was time for fall clean up I noticed that it had a couple of bean pods on it. I picked them and opened them. The beans were a wonderful baby blue color. I had no idea beans could be blue. I put them into my pocket to show my wife. That evening when I pulled them out of my pocket I was surprised to find that they had changed to a brown color. That started my search for blue beans. I learned that an heirloom bean had been found in Italy that was a rich, blue color. Joseph Simcox is a plant explorer and he named the bean 'Nonna Agnes.' At that time finding a source of Nonna Agnes was difficult. A few places seemed to be selling online and I was eventually able to get some. I planted my first seeds in the spring of 2019. At harvest time I was disappointed by the coloration. No blue beans. I learned from others that the temperature at time of maturity influences seed color. Cooler temperatures increase the chances of getting blue beans.