Well Eleanor, it is still a work in progress. The first three small patches produced a few short stalks that were looking pretty good, and then before the sorghum was ready to harvest the flower heads disappeared. I did not see it happen, however I am assuming that it was a squirrel or a rat that severed the tops and ran off with them. There are still a few stalks ripening now, and I am hopeful that I will be able to cut and dry them before critters get them. Given that I am new to this I am not 100% sure how to know when they should be harvested for grain. I tested them once by pressing my fingernail on the little spheres and they were still soft and pliable, so I figured they needed to mature a bit more.
As support poles for beans they did not perform well, which may have been a result of our hot dry weather. They grew too slowly so the pole beans had nothing to cling to. However, I am noticing that the last patch has much taller sorghum, now that the rains have returned; the sorghum is finally taller than the bean plants. If I try sorghum bean poles again I will give the sorghum a two or three week head start before I plant the beans, and I will try to give them more water.
The last issue that we had with sorghum was rust-- lots of it-- but the rust didn't seem to hurt the plants. From what I read rust is species-specific, so it did not affect the pole beans either.
On the plus side is now I know what sorghum plants look like, and I will definitely try to grow them again. They were quite a conversation starter, with many people asking me about the 'corn' that I was growing.