found this blog on how to build a prairie at https://marcpastorek.com/how-to-build-a-prarie/ . Article was written by Charles Allen, active in the Cajun Prairie Society.
Pictures below shows recreating and a recreated Bayou Savannah (prairie under an open canopy of trees) at Hermann Park, near 6520 Almeda, Blvd, Houston.
Photos were taken in January and July, 2012:
Planted and they will come!