OSI is a hometown company. You’ve probably seen our yellow trucks and vans on your street caring for some of the most beautiful lawns around. We currently serve more than 1400 residential and commercial customers throughout Bismarck-Mandan. We’d like the opportunity to make your property look just as nice as the others we tend. At OSI we believe our success begins with satisfying one customer at a time. Quality granular fertilizers Pre and post-emergent weed/crabgrass control Power core aeration Tree/Shrub spraying, injection, root feeding Free service calls Beautiful lawns since 1985