Hi Scrumhalf
Many thanks for your extremely interesting post.
Although I am looking for info around the 1800s to try to trace my ggrandfather, his sons were also market gardeners in Rumney during the time you have talked about. My grandfather's name was George Ford Williams and his brother Harry Ford Williams. I don't suppose this rings any bells?
My auntie tells me that George Williams at one point had a small farm with a horse and cart, he also had a very large white dog.
Also one address that does not exist now but may have back then was 'Greenway Fach,' does this sound familiar.
Regards
Sue