Best Management Practices for Establishment of Salt-Tolerant Grasses on RoadsidesStatus: CompleteReport Date: 07/31/2017 Summary: Kentucky bluegrass, the grass species that MnDOT typically uses for roadsides, was sensitive to salt; many installations could not tolerate winter deicing salts and died. Research on salt-tolerant grasses begun in 2009 resulted in MNST-12, a grass mix of fine fescues (with 20 percent Kentucky bluegrass for sod cutting, transport and installation stability) that is more salt-tolerant. MNST-12 was installed at many roadsides sites but by 2013, many MNST-12 installations were not thriving. Research into the reasons for these failures and the ways to best establish and care for MNST-12 revealed that this salt-tolerant grass mix requires a different planting and irrigation regimen than the standard MnDOT protocols that had been used for decades on Kentucky bluegrass. When installed as seed, MNST-12 should be planted in August or September; when installed as sod, it can be laid between May and November if sufficient irrigation is available. MNST-12 roots slowly and needs a particular irrigation regimen in early stages. Moisture replacement of 60 percent of its evapotranspiration rate is sufficient to promote establishment. Final Deliverables: Best Management Practices for Establishment of Salt-Tolerant Grasses on Roadsides (Report #2017-31) Establishment and Care of Salt-Tolerant Grass on Roadsides (Research Summary) Related Materials: New recommendations aim to help turfgrass thrive on Minnesota roadsides (News/Publication Article) Related Research: Regional Optimization of Roadside Turfgrass Seed MixturesÿÂ