This excerpt taken from the SMG DEF 14A filed Dec 19, 2008.
From Port Columbus to The Scotts Miracle-Gro Company World Headquarters, The Berger Learning Center:
Leaving Port Columbus, follow signs to I-270 North. Take I-270 around the city to Dublin. Exit Route 33 to Marysville (northwest) and continue approximately 15 miles.
Take the Scottslawn Road exit. Make a left and cross over the highway. The Scotts Miracle-Gro Company World Headquarters Horace Hagedorn Building is the first left. Follow signs for entry into The Berger Learning Center.