I live in the region and I'm looking to plant native in my yard! I'd like to socialize with other growers of plants native to my ecosystem, it would help me learn what I'm doing with them since the only plants I grow right now are orchids.. Should be getting a good selection of natives soon from Limestone Tortise, though.. Help me out y'all!
r/NoLawns
r/xeriscape
There is not much just for "South Texas"
r/AustinGardening <- is good sometimes
There are a lot of subcategories for specific plant families.
r/Euphorbiaceae
I also live in the area apparently the Mitchell lake Audubon center has good examples of the natural landscape type
The Botanical Gardens in Corpus are pretty educational and folks are friendly. You might consider joining some of the regional gardening groups on FB. I know, it’s FB but those groups are a better bet than Reddit.