Have you tried Fox or Turners? Would think both Lowes and Home Depot will have them, but probably not till spring. Good luck

I think that it is great that you got magnolia trees to grown in south Texas. I love magnolia trees, but remember they like to have acidic soil which most of south Texas doesn't have. When I moved into my house, the former owner had planted one. It was about 6' tall and was still 6' tall with one or two leaves on it 5 years later. So I cut it down. Maybe if you keep your soil amended you can keep them going. And I would check at Turners.

Itcollins1949 We live in the Richmond Texas area and did live on the Coast and I see them everywhere here. So they sure do find without acidic soil as they grown where no one has lived for years, but they might need help until established.

texas_lawn_ranger you need to contact your local extension agent in your area as they should be the most help. You should have a Master Gardner program in that area also and they usually are a great help also.