This version is not peer-reviewed. Grace Carapezza,Sandra B. Wilson *,Mica McMillan,Mack Thetford Grace Carapezza,Sandra B. Wilson *,Mica McMillan,Mack Thetford This version is not peer-reviewed. Container production of landscape plants requires reliably consistent and affordable substrates with properties suitable for a wide range of species. Native plant production often requires additional considerations when determining ideal substrates for species found in precise ecosystems.