I noticed today that there are tonnes of dandelions infront of the building I work at. I'm not sure if the area has ever been sprayed with any weedkiller is my problem. There's daffodils growing beside them so I don't think there is weed killer but what do you guys think, would you chance it. When I googled it this was the result I found: "If weed killer was still present in the soil, you would not be able to grow anything. This is why most weed killers are designed to evaporate within 24 to 78 hours. This means that for the most part, it is safe to plant anything, edible or non-edible, in a place where you have sprayed weed killer after three days". Thanks in advance for your help