If you take the seeds of a plant that’s growing on a lawn that’s been treated, and moved it to soil that’s not been treated,

Question

would the resulting plant still have any of the toxins? Trying to grow dandelions this way, both for viewing and possible consumption. This sounds strange, but I like them.

Answer 1

Yes, but trace amounts and only for a very short period. Just don't harvest anything from that plant. Let it reproduce and harvest future generations. This will ensure that there are no toxins by the time that you go to eat them.

This article tells about more tasty dandelion varieties and how to prepare them.

https://www.gardeningknowhow.com/edible/herbs/dandelion/growing-dandelion.htm