Thanks for your questions about planting a pollinator/monarch garden. In addition to the information on our website, Monarch Joint Venture has some great gardening resources.
http://monarchwatch.org/garden/
http://monarchwatch.org/garden/plant-list-monarchwatch.pdf
Texas plant list: http://monarchwatch.org/garden/plant-list-tx-monarchwatch.pdf
http://monarchjointventure.org/get-involved/create-habitat-for-monarchs
http://monarchjointventure.org/images/uploads/documents/GardeningforMonarchs.pdf
https://ourhabitatgarden.org/home/creatures/monarchs/milkweed/growing/
Check the BONAP maps to determine what milkweed is native to your area. Light green counties are where that species of milkweed has historically been found. http://www.bonap.net/NAPA/TaxonMaps/Genus/County/Asclepias