Construction And Materials

Earthwork and erosion control

Current seed application date extensions or delays: Spring cutoff date for native grass seeding has been extended to June 10, 2019. Any extensions for native seeding past this date or extensions for other seed mixes are at the discretion of the engineer on a project by project basis.

Approved Seed Conditioners

  • Iowa - go to "Approved Conditioners"
  • Illinois - see list under "Seed Directories"
  • Minnesota - go to "Approved Facilities"
  • Missouri - contact Missouri Crop Improvement Association, 573-449-0586
  • Nebraska
  • South Dakota - go to "South Dakota Certified Seed Grower Directory," and choose the current Issue
  • Wisconsin - contact Wisconsin Crop Improvement Association, 1-800-892-1341