Woodridge Animal Hospital
(630) 985-3101
2009 W. 75th Street, Woodridge, IL  60517
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Organic Lawn Treatments
(If you don't have a pet who will eat them all for you.)
Pre-emergent Weed Control
These are used on lawns primarily in the spring before the weeds have had a chance to emerge.  The most common organic formulations are composed of corn gluten meal.  The use of corn gluten meal was discovered by accident during turfgrass disease research at Iowa State University.  In 2006, a group at Ohio State University was not able to duplicate Iowa's results using products on the market available commercially.  They theorized that the effectiveness may be linked to the length of time since it was cultivated (like an expiration date for potency).  Corn gluten meal is not harmful if your pet ingests it.  However, to make sure your lawn gets full benefit, apply it before a rain is predicted or water the lawn after application to minimize your pet's ability to eat it.  The most recent information on the ongoing research can be found at 
Selective Weed Management
These products are used on lawns to treat weeds that have already emerged.  When applied as directed, they will kill weeds but not the lawn.  The most common organic formulations are composed of chelated iron.  There are 3 formulations I could find online (Fiesta, Nativa, and Iron X).  Some of the science behind the use of this ingredient can be found at
Non-selective Weed Management
These products are used on weeds that have already emerged.  They will kill the weed AND any other plant material they come in contact with.  The most common organic formulations have vinegar as their main ingredient.  You can also find receipes to make this weed treatment at home.  Research has found that the formulations with soap and salt as ingredients tend to be more effective.  Some of the science behind the use of vinegar to control weeds can be found athttps://extension.umd.edu/sites/extension.umd.edu/files/_docs/programs/ipmnet/Vinegar-AnAlternativeToGlyphosate-UMD-Smith-Fiola-and-Gill.pdf