Planting after using weed killer
I am a first time home owner. There is a stump on the side of our house. It's roots kept sending up new shoots of growth, so I killed them. This is the stuff I used: http://www.homedepot.com/Outdoors-Garden-Center-Lawn-Plant-Care-Lawn-Weed-Control-Grass-Weed-Killer/h_d1/N-5yc1vZbx5e/R-100619078/h_d2/ProductDisplay?langId=-1&storeId=10051&catalogId=10053
I used this because the Home Depot guy said that you could grow things over the poisoned area faster than the other brands. When the drought here lifts I plan on burning out the stump and roots.
My question is when would it be safe to grow edibles in the area? What steps should I take to make sure things are safe? Thanks!