Three years ago, I started trying to reduce the number of dandelions in my lawn with a household selective herbicide named Scotts® EcoSense® Weed B Gon® (MSDS and retailer product page). The manufacturer's web site says:
Weed B Gon controls dandelions and other broadleaf weeds without harming the grass. It is made from iron, an ingredient found in the natural environment.
The last time I treated the lawn with Ecosense Weed B Gon was about one year ago. I still have all the dandelions, but this year my wife has said that she wants to try making food products from the dandelion roots in our lawn (examples of dandelion foodstuffs).
Is it safe to consume dandelions from a lawn previously treated with a household selective iron herbicide?