I think this is probably better to do as a late night thing rather than early morning. It's true, everything is basically gone before 6 am. So go around midnight maybe. Also, I took an uber there and typed in Quang Ba Flower Market.... which took me about 1 mi past that to another market. I didn't know any better and checked out this other market that was just being set up..... people were very confused as to my presence. I found a lady selling flowers and we were able to communicate enough to know that I was not there. So i walked a mile down the side of the highway and saw a beautiful sunrise, and made it to the flower spot. There was not much left, but it was still kind of lovely. I wound up having a great morning walking around the Tay Ho district afterwards.